Air bearing surface design for constant fly height profile

Details Air bearing surface design for constant fly height profile Air bearing surface design for constant fly height profile

1998-04-06

2000-09-05

Tupper, Robert S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360237, G11B 2121, G11B 560

Patent

active

06115329&

ABSTRACT:
The air bearing design consists of four rectangular pads. Each pad features an open rectangular pocket located at the comer of the leading and inner (closer to the disc ID) edges. The pocket opens towards the slider's leading and inner edges. The increase in linear velocity from ID to OD dictates that the slider flies lower at ID than OD. The introduction of the open pocket can effectively offset the difference due to the linear velocity. As we move from ID to OD, the steps that the skewed airflow encounters change from the forward to reverse. Consequently, the lifting force generated by the air compression at the forward steps decrease, while the suction force produced by the air expansion at the reverse step increases, reaching a maximum at OD. Both of them offset the effect of the linear velocity, yielding a constant fly height profile from ID to OD. In addition, the open pockets toward the inner edge generate more air bearing compression for the incoming side flow, improving the ramp-loading dynamic stability under large roll static attitude. The open pocket can be either a step or ramp surface, and the number of pads can be varied. The air bearing design is scalable to achieve different fly heights.

REFERENCES:
patent: 4633450 (1986-12-01), Gueugnon
patent: 4893207 (1989-01-01), Maury et al.
patent: 5677812 (1997-10-01), Cha
patent: 5748408 (1998-05-01), Barrois et al.
patent: 5754367 (1998-05-01), Chang et al.
patent: 5889637 (1999-03-01), Chang et al.
patent: 5894379 (1999-04-01), Koishi et al.

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