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US 2002/0054563 A1Published application
Optical disc
AssigneesPioneer Video Corporation, Pioneer Electronic Corporation
InventorsNOBUKI YAMAOKA, SATORU FUKUOKA
Life of this patent
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Abstract
An optical disc comprises; a substrate; grooves concentrically or helically formed on the substrate in each of which data is recorded; lands defined between the adjacent grooves; and prepits formed on the lands, wherein each of the prepits is disposed to be shifted from a center line of the land toward a groove to be paired without overlapping with adjacent tracks, whereby reducing cross-talk from adjacent tracks and improving the density of recorded data.
Claims4
An optical disc comprising;
- a substrate;
- grooves concentrically or helically formed on said substrate in each of which data is recorded;
- lands defined between the adjacent grooves;
- and
- prepits formed on said lands, wherein each of said prepits is disposed to be shifted from a center line of said land toward a groove to be paired without overlapping with adjacent tracks.
2 more elements
Dependencies are inferred from the claim text.