Phase-change optical recording medium having first and second track pitches
US7616552B2 · kind B2 · utility
4Cited by
7References
9Claims
0Family size
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Key dates
| Filing date | Feb 10, 2003 |
| Grant date | Nov 10, 2009 |
| Priority date | — |
| Expiry date | Nov 10, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2537
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disc or other optical recording medium enables reading barcode-shaped-BCA marks in a burst cutting area (BCA) with tracking on while making tampering with the BCA marks difficult. The optical disc 100 has a first area 102 containing tracks at a first track pitch d2, and a second area 101 containing tracks at a second track pitch d1. The barcode-shaped marks 104 are recorded in the second area, and the second track pitch is wider than the first track pitch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.