Optical disc and optical disc device

• US 8,036,086 B2
• Filed: 08/19/2005
• Issued: 10/11/2011
• Est. Priority Date: 02/16/2005
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Ogawa, Masaharu, Takeshita, Nobuo, Nakahara, Hironori
• Primary Examiner(s): Feild; Joseph
• Assistant Examiner(s): HEYI, HENOK G
• Application Number:
  US11/579,832
• Publication Number:
  US 20080025183A1
• Time in Patent Office: 2,244 Days
• Field of Search: None
• US Class Current: 369/94
• CPC Class Codes: G11B 19/122 involving the detection of an identification or authentication mark record carriers indicating unauthorised or prior use G11B23/28
• CPC Class Codes: G11B 20/1217 on discs
• CPC Class Codes: G11B 2007/0006 adapted for scanning different types of carrier, e.g. CD & DVD
• CPC Class Codes: G11B 2007/0013 for carriers having multiple discrete layers
• CPC Class Codes: G11B 2220/235 Multilayer discs, i.e. multiple recording layers accessed from the same side
• CPC Class Codes: G11B 27/105 of operating discs
• CPC Class Codes: G11B 27/329 on a disc [VTOC]
• CPC Class Codes: G11B 7/00736 Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information sector headers or adresses in prepits G11B7/00745; address data in track wobble G11B7/24082
• CPC Class Codes: G11B 7/0079 Zoned data area, e.g. having different data structures or formats for the user data within data layer, Zone Constant Linear Velocity [ZCLV], Zone Constant Angular Velocity [ZCAV], carriers with RAM and ROM areas
• CPC Class Codes: G11B 7/0945 Methods for initialising servos, start-up sequences
• CPC Class Codes: G11B 7/1275 Two or more lasers having different wavelengths
• CPC Class Codes: G11B 7/24038 Multiple laminated recording layers

Abstract

In a multilayer optical disc having information layers conforming to a plurality of different optical disc standards, because the type of each information layer is not recorded in the other information layers, in read and write operations by a compatible optical disc device conforming to a plurality of optical disc standards, every time the information layer being accessed changes, it has been necessary to read the type of the information layer and select a method of generating a tracking error signal adapted to the type of information layer, so access has taken time. In order to solve the above problem, in the optical multilayer disc according to the present invention, having information layers conforming to a plurality of different optical disc standards, in an area in one of the information layers, information about the other information layers is recorded. The time required to access the other information layers can be reduced.

Claims

1. An optical data storage medium comprising:

at least one recording layer having a track upon which a laser beam is focused during use; and

a management area provided on said at least one recording layer, said management area having recorded data representing if another recording layer is present in said medium,

wherein said recorded data represents if another recording layer of different recording type is present in said medium and in a case that said another recording layer of different type is not present in said medium said recorded data indicates that said another recording layer of different recording type is not present in said medium.

2. An optical data storage medium according to claim 1,

wherein said management area is provided on a recording layer with a recording density higher than any other recording layer of said optical data storage medium.

3. An optical data storage medium according to claim 1,

wherein said recorded data is assigned a bit 0 if no other recording layer is present in said medium.

4. An optical data storage medium according to claim 2, wherein said recorded data is assigned a bit 0 if no other recording layer is present in said medium.