Disk drive having a mass balanced head gimbal assembly

Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record

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Details

G11B 558

Patent

active

059368039

ABSTRACT:
The invention resides in a magnetic disk drive having a load beam assembly that forms a part of a head gimbal assembly and head stack assembly in a magnetic disk drive.
The load beam assembly is uniquely mass balanced to prevent head slap by preventing an acceleration in the Z-direction from causing the transducer head to separate from the disk. The load beam assembly is preferably mass balanced by providing a load beam balancing member that is rigidly connected to the elongated load beam about a transverse axis of the hinge member. The balancing member can form the balancing mass or the balancing member can carry a discrete balancing mass. The balancing member may be divided into two halves that move on either side of the base portion, but is preferably comprised of a narrow, centrally located member that moves within an aperture formed in the base portion. The mass balanced load beam assembly can beneficially be manufactured from the same stainless steel sheets used to form conventional load beam assemblies. The balancing member may also be flexibly connected to the load beam by a spring hinge having a spring constant which, in concert with the mass of the balancing member, makes the balancing member oscillate in opposition to the disk to actively bias the head against the disk following a shock event.

REFERENCES:
patent: 4980787 (1990-12-01), Iwanaga
patent: 5060099 (1991-10-01), Yaeger et al.

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