Optical disc recording method and apparatus
US6819644B2 · kind B2 · utility
10Cited by
15References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 18, 2001 |
| Grant date | Nov 16, 2004 |
| Priority date | — |
| Expiry date | Oct 18, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/126
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for recording on a write-once type optical disc. A laser light beam excited to light emission by a recording pulse having a pulse width corresponding to the length of a pit formed, with the recording power of substantially the leading end of the pulse being stepped over plural stages, is illuminated on a write-once type optical disc for recording. This enables recording with an optimal pit shape at a speed faster than a quadrupled speed, such as at an octupled speed or a duo-deca-tupled speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.