Optical information recording disc and apparatus for driving the disc
US5072438A · kind A · utility
15Cited by
17References
27Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Mar 29, 1989 |
| Grant date | Dec 10, 1991 |
| Priority date | — |
| Expiry date | Mar 29, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B23/0035
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical information recording disc having at least one substrate for recording/reproducing information through an optical unit wherein a spindle hole, through which a spindle is provided as a disc drive system, is formed in a central portion of the substrate and an engagement member engageable with a disc engagement member integrally formed with the spindle, is formed around the central portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.