Double-layer optical disk, recording method and manufacturing method of this optical disk
AssigneeVictor Company of Japan, Ltd.
InventorMasaki Mochizuki
Life of this patent
Estimating the term…
Abstract
A double-layer optical disk comprises first and second substrates which include information pits and are bonded at their confronting faces. Each substrate has at least one information pit formed on a surface thereof for recording the information, and receives reproduction light irradiated from a predetermined reading direction. And, the information pit formed on the first substrate is different in size from the information pit formed on the second substrate.
Claims15
A double-layer optical disk comprising:
- first and second optical disks disposed in parallel to each other and bonded at their faces to form a double-layer configuration, each optical disk having information pits formed on a surface thereof for recording information and receiving a single reproduction light irradiated from a predetermined reading direction for reading said first and second optical disks and which passes through said first layer when reading information on said second layer, wherein
- the information pits formed on said first optical disk are different in a fundamental pit size from the information pits formed on said second optical disk by an amount which corrects for an optical influence of a reflection layer intervening between pit surfaces of said first and second optical disks thereby equalizing an effective pit size of the first optical disk with an effective pit size of the second optical disk when seen from said predetermined reading direction of said reproduction light.
A recording method for a double-layer optical disk which comprises first and second optical disks disposed in parallel to each other and bonded at their faces to form a double-layer configuration, each optical disk having information pits formed on a surface thereof for recording the information and receiving a single reproduction light irradiated from a predetermined reading direction for reading each of said first and second optical disks which passes through said first optical disk when reading said second optical disk, said recording method comprising the step of recording the information on both of said first and second optical disks by differentiating a fundamental pit size of the information pits formed on said first optical disk from a fundamental size of the information pits formed on said second optical disk by an amount for correcting an optical influence of a reflection layer intervening between pit surfaces of said first and second optical disks, thereby equalizing an effective pit size of the first optical disk with an effective pit size of the second optical disk when seen from said predetermined reading direction of said reproduction light.
A manufacturing method for a double-layer optical disk which comprises first and second optical disks disposed in parallel to each other and bonded at their faces to form a double-layer configuration, each optical disk having information pits formed on a surface thereof for recording the information and receiving a single reproduction light irradiated from a predetermined reading direction for reading said first and second optical disk, which passes through said first optical disk when reading said second optical disk, said manufacturing method comprising the step of forming the information pits on said first optical disk, and forming the information pits on said second optical disk, said first and second optical disks information pits being different in a fundamental pit size by an amount for correcting an optical influence of a reflection layer intervening between pit surfaces of said first and second optical disks, thereby equalizing an effective pit size of the first optical disk with an effective pit size of the second optical disk, when seen from said predetermined reading direction of said reproduction light.
Dependencies are inferred from the claim text.