Optical recording medium, recording system and reproducing system
US5479394A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 1992 |
| Grant date | Dec 26, 1995 |
| Priority date | — |
| Expiry date | May 15, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/25716
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical recording medium includes in sequence a transparent substrate, a light-reflecting layer, a transparent intermediate layer and a light-absorbing layer. The light-reflecting layer, the transparent intermediate layer and the light-absorbing layer in combination constitute a multi-layer optical element showing a high reflectance with respect to a reproducing light beam having a wavelength .lambda..sub.r. The resultant high reflectance state in the non-recorded region provides a high contrast in comparison with a record pit when the high reflectance multi-layer optical element is destroyed, and also provides the record with an improved resistance to degradation due to irradiation with the reproducing light beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.