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AssigneeSharp Kabushiki Kaisha
InventorsJunsaku Nakajima, Hitoshi Takeuchi, Masaru Nomura, Kenji Ohta
Estimating the term…
An optical disk has a lead-in region provided at the inner circumference side and a user region provided at the outer circumference side. Pit string 3 of pits of different depths-is-formed-in-the-lead-in-region. Light beam reflected from the pit string is detected by detector and TPP and RF signals are output by differential amplifier and addition amplifier. A ternary signal is restored from pits based on the TPP and RF signals. Information is recorded by pits of the same depth in the user region. Recording information in the depth direction in the lead-in region increases the recording capacity thereof The information recorded in the depth direction in the lead-in region cannot be transferred to a user region of another optical disk.
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A reproduction method of an optical recording medium
A reproduction method of an optical recording medium recorded with information on a substrate, said optical recording medium including a first region having first information recorded at least in a depth direction of said substrate by pits of at least two different depths formed on said substrate, and a second region having second information recorded in a plane direction of said substrate by at least one of the absence/presence, the length, the width and the position of a pit formed on said substrate, said reproduction method comprising the steps of:
A reproduction apparatus of an optical recording medium recorded with information on a substrate, said optical recording medium including a first region having first information recorded at least in a depth direction of said substrate by pits of at least two different depths formed on said substrate, and a second region having second information recorded in a plane direction of said substrate by at least one of the presence/absence, the length, the width and the position of a pit formed on said substrate, said reproduction apparatus comprising:
A reproduction apparatus of an optical recording medium recorded with information on a substrate, said optical recording medium including a first region having first information recorded at least in a depth direction of said substrate by pits of at least two different depths formed on said substrate, and a second region having second information recorded in a plane direction of said substrate by at least one of the presence/absence, the length, the width and the position of a pit formed on said substrate, said reproduction apparatus comprising:
A recorded information identification method of an optical recording medium recorded with information on a substrate, said optical recording medium including a region in which the presence of pits having at least two different depths formed on said substrate indicates identification information that is unique to said optical recording medium, said identification method comprising the steps of:
A recorded information identification apparatus of an optical recording medium recorded with information on a substrate, said optical recording medium including a region in which the presence of pits having at least two different depths formed on said substrate indicates identification information that is unique to said optical recording medium, said recognition apparatus comprising:
An optical recording medium that can have information recorded on a substrate, comprising:
A reproduction method of an optical recording medium that can have information recorded on a substrate, said optical recording medium including a first region having first information recorded at least in a depth direction of said substrate by pits of at least two different depths formed on said substrate, and a second region that can have second information recorded in a plane direction of said substrate by at least one of the presence/absence, the length, the width and the position of a mark formed on said substrate, said reproduction method comprising the steps of:
A reproduction method of an optical recording medium that can have information recorded on a substrate, said optical recording medium including a first region having first information recorded at least in a depth direction of said substrate by pits of at least two different depths formed on said substrate, and a second region that can have second information recorded in a plane direction of said substrate by at least one of the absence/presence, the length, the width and the position of a mark formed on said substrate, said reproduction method comprising the steps of:
A reproduction apparatus of an optical recording medium that can have information recorded on a substrate, said optical recording medium including a first region having first information recorded at least in a depth direction of said substrate by pits of at least two different depths formed on said substrate, and a second region that can have second information recorded in a plane direction of said substrate by at least one of the presence/absence, the length, the width and the position of a mark formed on said substrate, said reproduction apparatus comprising:
A reproduction apparatus of an optical recording medium that can have information recorded on a substrate, said optical recording medium including a first region having first information recorded at least in a depth direction of said substrate by pits of at least two different depths formed on said substrate, and a second region that can have second information recorded in a plane direction of said substrate by at least one of the presence/absence, the length, the width and the position of a mark formed on said substrate, said reproduction apparatus comprising:
Dependencies are inferred from the claim text.