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Load/Unload Suspension Device for Self-Loading Air Bearings

IP.com Disclosure Number: IPCOM000044217D
Original Publication Date: 1984-Nov-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 64K

Publishing Venue

IBM

Related People

Erpelding, AD: AUTHOR

Abstract

A system for loading and unloading of magnetic heads mounted on self-loading air bearing sliders is controlled by a layer of Ni-Ti alloy "memory wire". The suspensions 1 are designed to produce a force to unload the slider 2 from the disk (not shown) as the disk slows to a predetermined speed, and the self-loading slider 2 is designed to provide a loading force of sufficient magnitude to hold the slider at the selected flying height over the disk and counteract the suspension force loading while the disk is at its operating rotational speed. The load/unload mechanism comprises a flat ring 3 that is positioned between the upper and lower suspensions 1 so that a change in the shape of the ring 3 from a thin oval shape to a more rounded oval shape causes the slider 2 to be moved in close proximity to the disk.

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Load/Unload Suspension Device for Self-Loading Air Bearings

A system for loading and unloading of magnetic heads mounted on self-loading air bearing sliders is controlled by a layer of Ni-Ti alloy "memory wire". The suspensions 1 are designed to produce a force to unload the slider 2 from the disk (not shown) as the disk slows to a predetermined speed, and the self- loading slider 2 is designed to provide a loading force of sufficient magnitude to hold the slider at the selected flying height over the disk and counteract the suspension force loading while the disk is at its operating rotational speed. The load/unload mechanism comprises a flat ring 3 that is positioned between the upper and lower suspensions 1 so that a change in the shape of the ring 3 from a thin oval shape to a more rounded oval shape causes the slider 2 to be moved in close proximity to the disk. The ring 3 is comprised of a layer 4 of Ni-Ti alloy ("memory wire") onto the inside surface of which is laminated a layer 5 of Ni-Cr (nichrome). Two strips 6 of beryllium copper are provided to support the ring 3, to serve as electrical conductors to transmit current to the nichrome layer 5, and also to act as the returning force for the Ni-Ti layer 4. With power OFF, the force provided by suspensions 1 holds the slider 2 off the disk, and the Be-Cu conducting supports 6 deform the ring 3 into a flat oval. When power is turned ON, the disks begin to rotate, and a current is switched to the Ni-Cr elem...