| 发明名称 | Optical disc and optical disc device | ||
| 摘要 | 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 by using this information to select a tracking error signal generating method. | ||
| 申请公布号 | US8837266(B2) | 申请公布日期 | 2014.09.16 |
| 申请号 | US201314063776 | 申请日期 | 2013.10.25 |
| 申请人 | Mitsubishi Electric Corporation | 发明人 | Nakahara Hironori;Takeshita Nobuo;Ogawa Masaharu |
| 分类号 | G11B7/00;G11B7/24;G11B7/013;G11B7/007;G11B7/24038;G11B7/085 | 主分类号 | G11B7/00 |
| 代理机构 | Birch, Stewart, Kolasch & Birch, LLP | 代理人 | Birch, Stewart, Kolasch & Birch, LLP |
| 主权项 | 1. An optical data storage medium comprising: at least one recording layer, satisfying BD optical standard, having a track upon which a laser beam is focused during use; and a management area provided on said at least one recording layer satisfying BD optical disc standard, said management area having recorded data representing if another type of recording layer is present in said medium, wherein said recorded data represents if said another type of recording layer is present at a predefined depth of said medium, and said recorded data represents a depth at which said another type of recording layer should be present, and in case that said another type of recording layer is not present in said medium said recorded data indicates that said another type of recording layer is not present at said predefined depth, said recorded data is provided only on the management area of the layer satisfying BD optical disc standard, said recorded data represents absence of a recording layer by bit values of 00. | ||
| 地址 | Tokyo JP | ||