Optical information recording material and method of recording and reproducing information using same material
US4278734A · kind A · utility
26Cited by
2References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 8, 1979 |
| Grant date | Jul 14, 1981 |
| Priority date | — |
| Expiry date | Aug 8, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/165
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical information recording material comprising a thin film of a suboxide of a metal or semimetal of Group IIIB, IVB, VB or VIB, e.g. TeO.sub.x where x<2.0 or BiO.sub.x where x<1.5, added with up to 50 mole % of S and/or Se. When irradiated with light of relatively low energy density, the thin film exhibits such changes in optical density that information can be optically recorded on this material with high contrast ratio. Recorded information can be reproduced by either transmitted light or reflected light and, when desired, can be erased by light irradiation of adequate energy density.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.