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Browse Prior Art Database

Asymmetrical Head Disk Alignment

IP.com Disclosure Number: IPCOM000114327D
Original Publication Date: 1994-Dec-01
Included in the Prior Art Database: 2005-Mar-28
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Shoji, N: AUTHOR [+3]

Abstract

Disclosed is an assembly method for Hard Disk Drives where the heads are assembled asymmetrically to the disk. An arbitrary offset of the gramload or the load force of the head suspension assembly can be compensated with this method.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Asymmetrical Head Disk Alignment

      Disclosed is an assembly method for Hard Disk Drives where the
heads are assembled asymmetrically to the disk.  An arbitrary offset
of the gramload or the load force of the head suspension assembly can
be compensated with this method.

      The hard disk drive is sensitive to the flyheight of the heads,
and this fly height is often deviated by the variance in gramload.
Gramload variance usually comes from the plastic deformation of the
suspension during the swaging process.  This variance is basically
uniform between upheads or down heads due to the direction of the
swaging.  Therefore, the typical gramload variance in one drive is
shown in the Figure.

      For example, by reducing the gramload in the up heads and
increasing it in the down heads, an even gramload is achieved.  This
can be easily be created by offsetting the actuator height toward the
up head an arbitrary amount.

      Another example would be to monitor the fly height while
actuator is assembled to the disk and make adjustment for an ideal
flyheight.