Information recording medium and apparatus using reversible phase change
US4982396A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 8, 1988 |
| Grant date | Jan 1, 1991 |
| Priority date | — |
| Expiry date | Apr 8, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B19/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An information recording method and apparatus therefor utilizes an information recording medium having a recording film enabling reversible phase change. The information recording medium is irradiated with an energy beam while relatively moving the information recording medium and the energy beam so as to at least enable recording of information in accordance with phase state changes of the recording film caused by irradiation of the energy beam. The energy beam is modulated so that an intensity of the energy beam obtains a first level having a high power for one portion of coded data information to be recorded, obtains a second level different from the first level for a predetermined time for another portion of the coded data information, and then again obtains the first level to enable recording of the coded data information independently of a previous recording state on the information recording medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.