Multilayer record carrier and device for scanning said carrier
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United States of America Patent
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Sep 16, 2003
Grant Date -
Aug 1, 2002
app pub date -
Oct 22, 2001
filing date -
Dec 19, 1994
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A record carrier provided with at least two parallel information layers suitable to be scanned by means of a single scanning head is described. Each information layer is provided with a control block in which information is stored which can be used for reading the user information stored in this information layer. The control blocks are placed in the record carrier in such a way that they can be sequentially read by means of a scanning device, with a minimum displacement of the scanning head. The user information may be stored in a first format in the first information layer, and the same user information may be stored in a second format in a second information layer. The first format may be a low-density structure and the second format may be a high-density structure.
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