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Browse Prior Art Database

Disk Warpage Improvement

IP.com Disclosure Number: IPCOM000114742D
Original Publication Date: 1995-Jan-01
Included in the Prior Art Database: 2005-Mar-29
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Nakamoto, T: AUTHOR [+4]

Abstract

Disclosed is a Hard Disk Drive system which has an configuration for avoiding the disk warpage. Disk warpage affects to head flying height of Hard Disk Drive. This affects is one of the most big parameter of read/write performance and reliability. Disks are mounted on a spindle motor and fixed by a top clamp with screws. Fig. 1 shows the configuration of the current disks fixed to spindle motor by using current spacers.

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This is the abbreviated version, containing approximately 100% of the total text.

Disk Warpage Improvement

      Disclosed is a Hard Disk Drive system which has an
configuration for avoiding the disk warpage.  Disk warpage affects to
head flying height of Hard Disk Drive.  This affects is one of the
most big parameter of read/write performance and reliability.  Disks
are mounted on a spindle motor and fixed by a top clamp with screws.
Fig. 1 shows the configuration of the current disks fixed to spindle
motor by using current spacers.

      The clamping force causes the elastic deformation of Clamp and
Hub, and this deformation generates the bending moment around disk
contact points.  As the result, the extreme edge of top disk goes up
and that of the bottom disk goes down.

      This design disclosed here provides the new spacers which
minimize the disk deformation and warpage.  The new configuration is
provided by utilizing the contrary moment generated by the disk
spacers'
deformation.  Fig. 2 shows the new spacers and their moment forces.