Optical disc, optical disc apparatus, and optical disc reproducing method

A reproducing method of reading a single-sided dual layer optical disc where a light transmission layer, a DVD layer as a first recording layer accessed with a red laser beam, an space layer, and a second recording layer accessed with a blue-violet laser beam are arranged in that order in the direction in which a laser beam enters, different format information being recorded on the DVD layer and the second recording layer, the area recording density of the second recording layer being three times or more that of the DVD layer, identification information indicating, that the second recording layer is formed, being formed with detail information related to the DVD layer on Physical format information on a control data zone in a Lead-in area of the DVD layer, and identification information indicating, that the DVD layer is formed, being formed with detail information related to the second recording layer on Physical format information on a control data zone in a Lead-in area and/or identification information indicating, that the DVD layer of low density is formed, being formed with the detail information related to the second recording layer on Physical format information on a BCA area of the second recording layer, wherein the information in the DVD layer includes initial screen information for a menu indicating that the optical disc includes DVD content and the second recording layer's content when audio and visual works recorded in an area in the DVD layer are played back, and the information in the second recording layer includes initial screen information for a menu indicating that the optical disc includes DVD content and the second recording layer's content when audio and visual works recorded in an area in the second recording layer are played back, the reproducing method comprising:

• accessing with a red laser beam and moving a focus spot back and forth in the direction of thickness of the optical disc, focusing on the DVD layer, making gain adjustments, turning on a focus servo, and then turning on a tracking servo;
• detecting from the identification information of the DVD layer that the second layer is present;
• and
• displaying on a monitor the menu that the second recording layer has been formed in the disc and that only the DVD layer can be reproduced.

A reproducing method of reading a single-sided dual layer optical disc where a light transmission layer, a DVD layer as a first recording layer accessed with a red laser beam, an intermediate layer, and a second recording layer accessed with a blue-violet laser beam are arranged in that order in the direction in which a laser beam enters, different format information being recorded on the DVD layer and the second recording layer, the area recording density of the second recording layer being three times or more that of the DVD layer, identification information indicating, that the second recording layer is formed, being formed with detail information related to the DVD layer on Physical format information on a control data zone in a Lead-in area of the DVD layer, and identification information indicating, that the DVD layer is formed, being formed with detail information related to the second recording layer on Physical format information on a control data zone in a Lead-in area and/or identification information indicating, that the DVD layer is formed, being formed with the detail information related to the second recording layer on Physical format information on a BCA area of the second recording layer, wherein the information in the DVD layer includes initial screen information for a menu indicating that the optical disc includes DVD content and the second recording layer's content when audio and visual works recorded in an area in the DVD layer are played back, and the information in the second recording layer includes initial screen information for a menu indicating that the optical disc includes DVD content and the second recording layer's content when audio and visual works recorded in an area in the second recording layer are played back, the reproducing method comprising:

• accessing with a blue-violet laser beam, moving a focus spot back and forth in the direction of thickness of the optical disc, and detecting that the DVD layer and the second recording layer are present;
• focusing on the second recording layer, making gain adjustments, turning on a focus servo, and then turning on a tracking servo;
• detecting from the identification information of the second recording layer that the DVD layer is present;
• displaying on a monitor the menu that the DVD layer is formed in the disc and that only the second recording layer can be reproduced.

A reproducing method of reading a single-sided dual layer optical disc where a light transmission layer, a DVD layer as a first recording layer accessed with a red laser beam, an intermediate layer, and a second recording layer accessed with a blue-violet laser beam are arranged in that order in the direction in which a laser beam enters, different format information being recorded on the DVD layer and the second recording layer, the area recording density of the second recording layer being three times or more that of the DVD layer, identification information indicating that the second recording layer has been formed being formed with detail information related to the DVD layer on Physical format information on a control data zone in a Lead-in area of the DVD layer, and identification information indicating, that the DVD layer is formed, being formed with detail information related to the second recording layer on Physical format information on a control data zone in a Lead-in area and/or identification information indicating, that the DVD layer is formed, being formed with the detail information related to the second recording layer on Physical format information on a BCA area of the second recording layer, wherein the information in the DVD layer includes initial screen information for a menu indicating that the optical disc includes DVD content and the second recording layer's content when audio and visual works recorded in an area in the DVD layer are played back, and the information in the second recording layer includes initial screen information for a menu indicating that the optical disc includes DVD content and the second recording layer's content when audio and visual works recorded in an area in the second recording layer are played back, the reproducing method comprising:

• using a red laser beam so as to move a focus spot back and forth in the direction of thickness of the optical disc and detecting that the DVD layer and the second recording layer are present;
• focusing on the DVD layer, making gain adjustments, turning on a focus servo, then turning on a tracking servo, and detecting the identification information indicating the presence of the second recording layer from the DVD layer;
• or
• using a blue-violet laser beam so as to move a focused state back and forth in the direction of thickness of the optical disc and detecting that the DVD recording layer and the second recording layer are present;
• focusing on the second recording layer, making gain adjustments, turning on a focus servo, then turning on a tracking servo, and detecting the identification information indicating the presence of the DVD layer from the second recording layer;
• and
• displaying on a monitor a message or a button which prompts the user to determine whether to reproduce the DVD layer or the second recording layer.

An optical disc of a single-sided dual layer where a light transmission layer, a first recording layer accessed with a blue-violet laser beam, a space layer, and a DVD layer as a second recording layer accessed with a read laser beam are arranged in that order in the direction in which a laser beam enters, different format information being recorded on the first recording layer and the DVD layer, wherein the information in the DVD layer includes initial screen information for a menu indicating that the optical disc includes DVD content and the first recording layer's content when audio and visual works recorded in an area in the DVD layer are played back, and the information in the first recording layer includes initial screen information for a menu indicating that the optical disc includes DVD content and the first recording layer's content when audio and visual works recorded in an area in the first recording layer are played back, the optical disc comprising:

• an area recording density of the first recording layer being three times or more that of the DVD layer;
• identification information indicating, that the second recording layer is formed, being formed with detail information related to the second recording layer on Physical format information on a control data zone in a Lead-in area and/or identification information indicating, that the second recording layer is formed, being formed with the detail information related to the second recording layer on Physical format information on a BCA area of the second recording layer, and
• identification information indicating, that the second recording layer is formed, being formed with detail information related to the DVD layer on Physical format information on a control data zone in a Lead-in area of the DVD layer.