Optical data storage disc
US5452282A · kind A · utility
29Cited by
9References
3Claims
0Family size
Inventor
Key dates
| Filing date | Jan 21, 1994 |
| Grant date | Sep 19, 1995 |
| Priority date | — |
| Expiry date | Jan 21, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/263
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A process for producing an optical data storage disc (e.g., a compact disc) carrying a digital recording and also carries a holographic image is disclosed. The holographic recording occupies an area (14) separate from the area (12) occupied by the digital recording, for example, the holographic recording may be positioned in an annular area encircling the central area occupied by the digital recording.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.