Erasable optical data storage medium having a zoned integral recording layer
US4901304A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 8, 1986 |
| Grant date | Feb 13, 1990 |
| Priority date | — |
| Expiry date | Oct 8, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An erasable optical data storage medium has an integral recording layer including an expansion zone and a retention zone having different optical and thermal-mechanical properties. A uniform integral layer of dyed polymer material has the dye leached out of the surface region and a second dye diffused into the surface region to create a retention zone. The retention zone has a higher elastic modulus and glass transition temperature than the underlying expansion zone and is adapted to absorb and transmit light which is centered about a different wavelength than the expansion zone. The medium is adapted to be used with a non-ablative and non-vesicular method to create and erase optically detectable deformations in the retention zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.