Information recording medium
US7260052B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 5, 2003 |
| Grant date | Aug 21, 2007 |
| Priority date | — |
| Expiry date | Nov 9, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0079
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A groove track and a land track are alternately and spirally formed on an information recording medium. On the land track neighboring the groove track, pre-information indicating position information of a track on a disc is formed as a prepit. On the information recording medium, an embossed area is formed so that information about a copyright and for preventing an illegal copy cannot be rewritten. In the embossed area, an embossed configuration including a pit and a space of predetermined depths is formed. The prepit in the embossed area is formed so that the prepit has an optimized configuration according to a pit length and a space length in the embossed area which the prepit neighbors. Consequently, interference between the embossed configuration and the prepit can be prevented even in a case that the prepit is formed in addition to the embossed configuration in the embossed area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.