Optical record blank and information record
US4568952A · kind A · utility
2Cited by
8References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1984 |
| Grant date | Feb 4, 1986 |
| Priority date | — |
| Expiry date | Dec 10, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A multi-layer optical record blank and information record comprises a light-reflective layer, a light-transmissive layer, a light-absorptive layer, and a heat-sensitive information layer wherein the thicknesses of the layers are chosen to achieve a low-reflection condition. Information is recorded as variations of an optical property in the information layer indirectly heated by light absorbed in the absorptive layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.