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Low-Profile Clamp and Inverted Hard Disk Drive Spindle Assembly

IP.com Disclosure Number: IPCOM000115755D
Original Publication Date: 1995-Jun-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 89K

Publishing Venue

IBM

Related People

Albrecht, D: AUTHOR [+2]

Abstract

A hard disk drive spindle claim is disclosed that has a very low profile without adversely affecting the disk recording area. The geometry of the clamp gives high compliance with large deflections for a given load without the plurality of circumferentially spaced fasteners introducing a corresponding circumferential waviness at the disk surface. An inverted spindle assembly geometry is also disclosed in which the preceding low profile clamp is captured by a feature on the spindle hub and the load applied by a very stiff flange member that is attached by threaded fasteners.

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This is the abbreviated version, containing approximately 52% of the total text.

Low-Profile Clamp and Inverted Hard Disk Drive Spindle Assembly

      A hard disk drive spindle claim is disclosed that has a very
low profile without adversely affecting the disk recording area.  The
geometry of the clamp gives high compliance with large deflections
for a given load without the plurality of circumferentially spaced
fasteners introducing a corresponding circumferential waviness at the
disk surface.  An inverted spindle assembly geometry is also
disclosed in which the preceding low profile clamp is captured by a
feature on the spindle hub and the load applied by a very stiff
flange member that is attached by threaded fasteners.

      Fig. 1 is a side elevation of a traditional hard disk spindle
(1) where this new clamp (2) is shown undeflected on the right hand
side and in the deflected or "clamped position" on the left hand
side.  The clamp consists of two shaped back to back disks arranged
in a belleville spring configuration that overhangs the magnetic
recording disk.  The undeformed contour of the shaped disks is such
that they become nominally parallel when compressed to the desired
clamp load.  The portion of the clamp nearest the recording disk (8)
is shaped such the magnetic recording slider can pass underneath (3)
thus avoiding  loss of recording area.  Large clamp deflections at
acceptable stress levels in the clamp material are realized by the
parallel belleville type spring arrangement.  This arrangement also
provides a long path length to the disk surface from the plural
threaded fasteners (7) that apply the clamp load.  This avoids the
introduction of a circumferentially wavy deformation at the disk
surface that often propagates from the screws in traditional clamps.
...