Phase change optical recording device and method employing a laser beam with differently energized pulse portions
US5367514A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1992 |
| Grant date | Nov 22, 1994 |
| Priority date | — |
| Expiry date | Nov 25, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed is an optical recording device of a phase change type including at least an optical recording medium having a recording layer formed of a recording material of a phase change type, and a control unit for controlling a unit laser beam, which is to be radiated for writing information onto the optical recording medium to form a recording mark, in such a manner that, when the unit laser beam is divided into front and rear portions with the middle point of the radiated portion of the recording medium as the boundary, the quantity of energy of the rear portion of the unit laser beam is greater than that of the front portion thereof. Also, in the optical recording device, when a recording mark is formed according to a multi-pulse recording system using a multi-pulse laser beam, the multi-pulse laser beam, at least the first pulse thereof is controlled so as to satisfy a similar condition as described above and after then the controlled multi-pulse laser beam or the controlled first pulse thereof is radiated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.