Optical disk compatible with two different reading systems
US6434107B1 · kind B1 · utility
11Cited by
13References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 17, 1998 |
| Grant date | Aug 13, 2002 |
| Priority date | — |
| Expiry date | Feb 17, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disc comprising two elementary discs glued to each other by a transparent glue layer. The first elementary disc comprises an information surface according to DVD standard and the second elementary disc comprises an information surface according to CD standard. The present optical disc may be read by a CD player for CD information and by a DVD player for DVD information. The problem of costs and other difficulties for ascending compatibility of DVD players is therefore solved while assuring a simple and smooth transition from CD discs to DVD discs for consumers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.