Optical disc humidity protected
US4517574A · kind A · utility
3Cited by
5References
27Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 21, 1983 |
| Grant date | May 14, 1985 |
| Priority date | — |
| Expiry date | Mar 21, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/24015
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A protected optical disc intended for the recording of information is protected against the harmful consequences of humidity by the presence of a hydrophylous material situated at a particular distance from the recording surface, which thus retains a high sensitivity during the write or read operations. The invention may be applied especially to discs intended for digital recording.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.