Optical data storage media
US5445853A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 8, 1993 |
| Grant date | Aug 29, 1995 |
| Priority date | — |
| Expiry date | Jan 8, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention is directed to an optical data storage medium in which a reflecting layer is formed on a substrate. A dye containing layer having a reflectivity of 15 to 25% is used as the reflecting layer, and a signal modulation degree of an information signal falls within a range of from 0.3 to 0.6. Further, a real number portion n of complex index of refraction of the reflecting layer is selected so as to satisfy n.gtoreq.1.84. According to the present invention, there is provided an optical data storage medium which can be reproduced by a recording and reproducing apparatus which is designed so as to record and reproduce a medium such as a magneto-optical disc or the like having a reflectivity of about 15 to 25%. Therefore, the recording and reproducing apparatus that can record and reproduce the medium having the reflecting layer whose reflectivity is low can be made small in size and light in weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.