Ablative optical recording medium
US4023185A · kind A · utility
55Cited by
4References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 19, 1976 |
| Grant date | May 10, 1977 |
| Priority date | — |
| Expiry date | Mar 19, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An ablative recording medium comprises a substrate coated with a light reflecting coating which in turn is coated with a light absorptive layer of 4-phenylazo-1-naphthylamine formed by evaporation of Sudan Black B dyestuff. During recording, portions of the organic coating are ablated, or vaporized, by a modulated focussed light beam, thereby exposing portions of the reflective layer and recording video information as a reflective-antireflective pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.