Reproduced signal quality judging method
US8599669B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 2012 |
| Grant date | Dec 3, 2013 |
| Priority date | — |
| Expiry date | Mar 16, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/00456
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Recording mark forming method utilizing a device including a laser and a laser drive carried by a pickup having a movement drive wherein a control controls the drives to irradiate a recording medium with laser pulse sequences to form recording marks having recording mark lengths between a predetermined and maximum lengths, a top section, a last section including a cooling period, and an intermediate period. Heat of mark front edges is controlled by top section recording parameters classified according to recording mark lengths and recording parameters of first through maximum recording mark lengths are classified into a same group. Heat of mark rear edges is controlled by cooling start positions for cooling periods classified according to recording mark lengths. Cooling start positions for a second predetermined mark length through the maximum mark length are classified into a same group. The second mark length is longer than the first mark length.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.