Browse Prior Art Database

Low Profile Hybrid Disk Enclosure

IP.com Disclosure Number: IPCOM000105452D
Original Publication Date: 1993-Aug-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 4 page(s) / 102K

Publishing Venue

IBM

Related People

Boutaghou, ZE: AUTHOR [+3]

Abstract

Disclosed is a hybrid disk enclosure cover for low profile, small form factor disk drives. Materials, such as plastics, that were weak structurally for larger form factor drives due to higher length/wall thickness ratios will now be used to our advantage.

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Low Profile Hybrid Disk Enclosure

      Disclosed is a hybrid disk enclosure cover for low profile,
small form factor disk drives.  Materials, such as plastics, that
were weak structurally for larger form factor drives due to higher
length/wall thickness ratios will now be used to our advantage.

      The wall thickness of file cover castings contributes
significantly to the overall height of small form factor drives.
Cover wall casting thicknesses are on the order of 0.8 mm -- with
these minimum thickness regions located over the spindle hub and
actuator (Fig. 1).

      The hybrid cover reduces the cover thickness over the spindle
hub and actuator to 0.1 mm.

      This cover design (Fig. 2) is composed of a molded plastic
frame that is encapsulated within a thin stainless steel membrane
(0.1 mm thick) on its exterior surface.  A plastic frame would be
used due to the ease and low cost of injection molding detailed
features (that would include breather and recirculation filter
features, for example), its low weight, and its uncoated chemical
compatibility within the disk enclosure.  The stainless steel
membrane would be simply die cut and stamped to fit the external
shape of the cover frame.

      The stainless steel membrane would be adhesively or
mechanically attached to the cover frame.  An additional option would
be to mold the frame with the stainless steel in place.  Stiffness of
the stainless steel component due to constraining the boundaries of
the thin membrane will provide the necessary structural rigidity to
the cover.  Deflection of this membrane would be no greater than for
the thin sections of traditionally cast or stamped metal covers.  In
addition to this, stainless steel does not require any special
coatings for DE use.  Because...