Browse Prior Art Database

A Technique for Shielding Read Write Heads from Stray Magnetic Fields in Direct Access Storage Devices

IP.com Disclosure Number: IPCOM000110216D
Original Publication Date: 1992-Oct-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 1 page(s) / 39K

Publishing Venue

IBM

Related People

Heggem, RA: AUTHOR

Abstract

Disclosed is a disk drive design in which the magnetic recording heads are shielded from stray magnetic fields by the addition of slats of shielding.

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This is the abbreviated version, containing approximately 98% of the total text.

A Technique for Shielding Read Write Heads from Stray Magnetic Fields in Direct Access Storage Devices

      Disclosed is a disk drive design in which the magnetic
recording heads are shielded from stray magnetic fields by the
addition of slats of shielding.

      Magnetic recording heads on disk drives are sensitive to stray
magnetic fields.  However, many disk drive designs require that a VCM
containing strong permanent magnets be placed in close proximity to
the heads.  Shielding is typically used to provide some protection to
the heads.

      The proposed invention maximizes the effect of this shielding
by placing additional slats of shielding material between the arms of
the head/arm assembly.  The improvement comes not from the mere
addition of the shield material, which may only be marginally
increased.  The gains are made in the fact that the slats are placed
in the most critical shielding location: directly between the heads
and the field source (voice coil motor or VCM).  The only
penetrations allowed are those needed for the passage of the
hardware.

      The shielding can be used in either linear or rotary actuator
designs.  Shield geometry need not be a factor, that is, the shield
need not be flat to work acceptably.

      In summary, the key to the proposed shielding is to add
material to the shield wherever penetrations do not occur, thereby
placing material in the location of greatest benefit from a shielding
standpoint.

    ...