Optical recording medium, method of recording information, method of reproducing information, apparatus for recording information, and apparatus for reproducing information
US5970039A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 1998 |
| Grant date | Oct 19, 1999 |
| Priority date | — |
| Expiry date | Mar 16, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B13/045
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of recording information in an optical recording medium, which comprises two steps. In the first step, a coherent light pulse train which resonates with a transition between the first and third energy levels and coherent light which resonates with a transition between the second and third energy levels or a transition between the first and second energy levels are applied to the optical recording medium, thereby causing the light pulse train to pass through the optical recording medium. In the second step, an intensity change of an external field is supplied to the medium, while the light pulse train is passing through the optical recording medium, thereby fixing sites in a thickness direction of the medium, at which the absorption spectrum of the medium is changed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.