Magnetic disk apparatus having shield space defined by cover and

Details Magnetic disk apparatus having shield space defined by cover and Magnetic disk apparatus having shield space defined by cover and

1996-10-18

1998-06-16

Renner, Craig A.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

360 9702, G11B 3314

Patent

active

057680515

ABSTRACT:
A magnetic disk apparatus includes a housing having a sealed spaced between a base and a cover plate. An electric motor is situated within the housing. The electric motor includes a shaft extending between the base and the cover plate, a rotor situated coaxially around the shaft, and a rolling bearing situated between the rotor and the shaft. A magnetic recording medium is supported on the rotor. The rotor has a seal portion interposed between the cover plate and the rolling bearing. The seal portion includes a first surface located near the outer peripheral surface of the shaft and defining a first gap between the first surface itself and the outer peripheral surface of the shaft and a second surface located near the cover plate and defining a second gap between the second surface itself and the cover plate. The first and second gaps communicate with each other to form a labyrinth seal between the space and the rolling bearing.

REFERENCES:
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patent: 5457588 (1995-10-01), Hattori et al.
patent: 5490021 (1996-02-01), Muller et al.

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