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US 6,724,717 B2Granted
Optical recording disc
AssigneeRicoh Company, Ltd.
InventorEiji Noda
Life of this patent
Estimating the term…
Abstract
An optical disc including a substrate having a top surface provided with a ROM area and a RAM area, and a recording layer provided on the substrate. The ROM area is provided with pre-grooves each having a bottom surface and wherein the RAM area is provided with pre-grooves. The ROM area also has pre-pits formed on the bottom surface of the pre-grooves thereof.
Claims5
An optical disc comprising
- a substrate having a top surface provided with a ROM area and a RAM area, and
- a recording layer provided on said substrate,
- wherein said ROM area is provided with pre-grooves each having a bottom surface, said ROM area has pre-pits formed on the bottom surface of said pre-grooves thereof, and said RAM area is provided with pre-grooves.
An optical disc comprising:
- a substrate;
- a recording layer provided on said substrate and including a ROM area and a RAM area;
- pre-grooves each having a bottom surface, provided in said ROM area and in said RAM area;
- and
- pre-pits formed on the bottom surface of said pre-grooves in said ROM area.
2 more elements
Dependencies are inferred from the claim text.