Optical information recording medium
US5154957A · kind A · utility
25Cited by
1References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 19, 1991 |
| Grant date | Oct 13, 1992 |
| Priority date | — |
| Expiry date | Jun 19, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24926
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical information medium has a transparent substrate which has a pair of optically smooth faces; a recording thin film which is formed on one of the faces of the substrate and is subjected to an optically detectable change upon irradiation of a laser beam thereon to; and a reinforcing plate which has a mechanical strength larger than that of the substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.