Magnetic disk cartridge with improved center plate for disk mounting
US4812937A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1988 |
| Grant date | Mar 14, 1989 |
| Priority date | — |
| Expiry date | Jun 23, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B23/0332
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a disk cartridge in which a sheet-like recording medium is fixed to the periphery of a circular center plate which has an approximately square center hole and an almost rectangular eccentric driving hole, and a cartridge rotatably accommodating the sheet-like recording medium and including an upper half and a lower half having a turntable insertion hole in which the circular center plate is loosely fitted; the sheet-like recording medium is positioned in the cartridge by restricting the movement of the circular center plate at the central portion thereof, so that the diameter of the circular center plate can be substantially decreased and aberration of tracking or the like during recording or reproducing is avoided as much as possible.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.