Magnetic disk cartridge

Details Magnetic disk cartridge Magnetic disk cartridge

1996-09-04

1998-06-02

Levy, Stuart S.

Dynamic magnetic information storage or retrieval

Record medium

In container

369291, G11B 2303

Patent

active

057610169

ABSTRACT:
A magnetic disk cartridge includes a magnetic disk, a cassette shell encasing the magnetic disk, and a disk-shaped center core which supports the magnetic disk and is adapted for rotation by a turntable equipped with an annular chucking magnet. A magnetic head access opening is formed in one side surface of the cassette shell, a center portion of the center core is formed with a center hole for engagement by a center locating pin of the turntable, and a peripheral portion of the center core is formed with a step-like annular chucking region whose level differs from that at the mouth of the center hole. The chucking region is adapted to make surface contact with the annular chucking magnet. The structure enables the chucking magnet to strongly attract and reliably secure the center core, thereby preventing slippage during high-speed rotation, and to prevent rotational vibration owing to unbalanced loading.

REFERENCES:
patent: 4847826 (1989-07-01), Sakaguchi et al.
patent: 4920441 (1990-04-01), Kimura et al.
patent: 5315470 (1994-05-01), Fujino et al.
patent: 5587994 (1996-12-01), Nagaura et al.

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