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US 7,920,460 B2Granted
Information recording medium, and recording method and reproducing method thereof
AssigneeVictor Company of Japan, Ltd.
InventorYasuhiro Ueki
Life of this patent
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Abstract
An information recording medium in which bottoms of a guide groove and a pit array formed on a disc substrate are allocated on a same flat plane and shaped in flat. Further, in a transition area from a pit array to a guide groove or from a guide groove to a pit array, the information recording medium is provided with an intermediate area composed of a pit array of which height changes from a height between a bottom and a side of a groove to another height between the bottom and a side of the pit array.
Claims11
An information recording medium comprising:
- (a) a lead-in area, said lead-in area including
- (1) a first track area having a first physical feature that is formed with emboss,
- (2) a first groove area having a second physical feature different from said first physical feature that is allocated in an inner circumferential side of said first track area,
- (3) a first connection area for continuously connecting said first track area to said first groove area,
- (4) a second groove area having a third physical feature different from said first physical feature that is allocated in an outer circumferential side of said first track area, and
- (5) a second connection area for continuously connecting said first track area to said second groove area;
- and
- (b) a data area including a third groove area having a fourth physical feature different from said first physical feature that is allocated in an outer circumferential side of said lead-in area.
5 more elements
Dependencies are inferred from the claim text.