Disc cartridge
US5043974A · kind A · utility
28Cited by
14References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 12, 1989 |
| Grant date | Aug 27, 1991 |
| Priority date | — |
| Expiry date | Sep 12, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B23/0321
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disc cartridge having a cartridge body in which a magneto-optical disc is rotatably accommodated in a hermetic-fashion so as to be capable of recording and/or reproduction. The cartridge body has a concave recessed portion extended from an insertion side end face of the cartridge body to a central portion of the cartridge body to allow the introduction of an external magnetic field generating means which generates an external magnetic field to record an information signal on the magneto-optical disc accommodated within the cartridge body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.