Method of optimally controlling the power of a recording laser beam
US5216660A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 17, 1991 |
| Grant date | Jun 1, 1993 |
| Priority date | — |
| Expiry date | Apr 17, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/126
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
This invention is directed to a method comprising the steps of detecting the intensity of a return laser beam from an optical recording medium of a recording laser beam for forming pits onto the optical recording medium at the time of a recording mode to record information thereon, and controlling a power of the recording laser beam on the basis of a ratio between a detected output of the intensity of a return laser beam within a predetermined time required until pits are actually formed on the optical recording medium and a detected output of the intensity of a return laser beam within a time period during which pits are actually formed, whereby even if the relationship between the recording laser power and pits formed varies due to characteristic unevenness, skew (inclination), or temperature of the medium, etc., this method permits formation of pits in a fixed reasonable dimension to carry out an optimum information recording.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.