Dye-polymer optical data storage media with improved recording sensitivity
US4879709A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 5, 1988 |
| Grant date | Nov 7, 1989 |
| Priority date | — |
| Expiry date | Feb 5, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improvement is disclosed relating to optical data storage media having two thermo-optically active layers which absorb light at distinct wavelengths and expansion layer in which data appear as bulges formed upon the absorption of light, and a retention layer which fixes such bulges inplace until it is selectively heated to a rubbery state permitting relaxation of the expansion layer and the consequent disappearance of the bulges. In accordance with the improvement, the retention layer is modified so that it absorbs a controlled amount of light at the wavelength which is absorbed by the expansion layer, with the result that it absorbs light at both wavelengths rather than just one. Direct heating of both layers by light absorption during recordation, and accordingly a faster recordation response, are thus achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.