Optical information recording medium having a protective film which can be stripped
US5020048A · kind A · utility
21Cited by
1References
13Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Dec 12, 1989 |
| Grant date | May 28, 1991 |
| Priority date | — |
| Expiry date | Dec 12, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/2595
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical information recording medium having at least a transparent substrate and a recording layer and capable of recording an information by irradiating the recording layer with laser beams from the transparent substrate side, wherein a protective film having hygroscopic property is formed on a light incident surface of the transparent substrate so that it can be stripped therefrom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.