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US 9,019,807 B2Granted
Optical disc with pre-recorded and recordable regions and method of forming the disc
AssigneeThomson Licensing
InventorsJohn Matthew Town, Alan Bruce Hamersley, Holger Hofmann
Life of this patent
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Abstract
An optical disc having a region with pre-recorded data and a recordable region, a method of fabricating the disc, a stamper for forming a disc master, and a recording device for use with the disc are disclosed. Data recorded in the recordable region may be used for activation of the disc, providing unique identification or enhancing program content on the disc.
Claims8
An optical disc, comprising:
- a recordable region having at least one groove with a plurality of gaps;
- wherein the at least one groove is configured for use in recording data, after disc manufacturing, to at least one of:
- the at least one groove and one of the plurality of gaps;
- and
- wherein each of the plurality of gaps has a length sufficient for differential phase detection tracking, and each of the plurality of gaps has a length less than about 200 nm.
2 more elements
An optical disc, comprising:
- a recordable region having at least one groove with a plurality of gaps;
- wherein the at least one groove is configured for use in recording data, after disc manufacturing, to at least one of:
- the at least one groove and one of the plurality of gaps;
- and
- wherein each of the plurality of gaps has a length sufficient for differential phase detection tracking, and the at least one of the plurality of gaps has a length less than about 200 nm.
2 more elements
Dependencies are inferred from the claim text.