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Hard Disk Drive Enclosure Sealing for Electromagnetic Noise Immunity

IP.com Disclosure Number: IPCOM000112786D
Original Publication Date: 1994-Jun-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Fujio, S: AUTHOR [+3]

Abstract

Disclosed is a Hard Disk Drive (HDD) Enclosure Sealing Method that remarkably improves immunity against External Electromagnetic Noise. The idea of this method is to keep perfect continuity of electrical conductivity among the enclosure parts with sealing function.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 70% of the total text.

Hard Disk Drive Enclosure Sealing for Electromagnetic Noise Immunity

      Disclosed is a Hard Disk Drive (HDD) Enclosure Sealing Method
that remarkably improves immunity against External Electromagnetic
Noise.  The idea of this method is to keep perfect continuity of
electrical conductivity among the enclosure parts with sealing
function.

      The metal enclosure usually is separated to a few parts for
production reason.  Then, sealing the parts is necessary to keep the
dust away from inside the enclosure, but the electrical discontinuity
at the sealing space allows the electromagnetic noise to come inside
the enclosure easily, as shown in Fig. 1.  The noise often makes for
data reading errors, which influences HDD performance.  The usual
method to shut the noise out is to add Shielding Tape or Plate of
Copper, Aluminum or Ferrite, etc..., around the enclosure, but this
isn't so effective.

      Figs. 2-5 show ways of realizing the idea.  Fig. 2 shows an
example of a Press-Type Enclosure.  The upper or lower enclosure has
sharp edges.  It is possible to make a perfect contact and sealing by
the sharp edges cutting into the other side with proper pressure from
both the upper and lower sides.  It is better to use a different
hardness material of the enclosure in this case.

      Fig. 3 shows another example of a Press-Type Enclosure using a
metal wedge.  It is possible to make perfect contact and sealing by
the wedge cutting into both enclosures...