Optical storage in discs having multiple data layers
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United States of America Patent
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Jun 24, 2008
Grant Date -
May 17, 2007
app pub date -
Oct 26, 2004
filing date -
Nov 4, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Optical pick-up apparatus for retrieving data stored on an optical storage disc having a plurality of record layers (6, 7), the radiation beam reflected back from the disc when a first layer (7) is irradiated comprising radiation reflected back from the first layer (7) and radiation reflected back from one or more of the other layers(6). A spatial filter (8) is provided which is arranged and configured to spatially filter the radiation beam so as to cause the radiation reflected by the first record layer (7) and the radiation reflected by any of the other record layers (6) of the optical storage disc to be spatially separated, such that at least a substantial portion of the radiation reflected back from the other layers (6) can be selectively eliminated from the radiation beam prior to retrieval therefrom of the data.
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