Method and apparatus for recording information using an energy beam of power levels changed stepwise
US5396480A · kind A · utility
22Cited by
5References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 24, 1993 |
| Grant date | Mar 7, 1995 |
| Priority date | — |
| Expiry date | Nov 24, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/00557
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A laser beam is radiated on a recording medium such as a phase transition type optical disk to change optical characteristics depending on a change in arrangement of atoms in a recording layer of the recording medium so as to repetitively record/erase information represented by the lengths of optical marks, the recording power of the laser beam radiated to record the information in the recording medium is changed stepwise in two or more power levels sequentially higher than an erasure power level of a laser beam radiated to erase the information recorded in the recording medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.