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Crosshatched Zone Texture for Magnetic Disks

IP.com Disclosure Number: IPCOM000112438D
Original Publication Date: 1994-May-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Hagan, JA: AUTHOR [+5]

Abstract

A means of crosshatching the texture in the S/S zone that will not only meet the tolerance requirements but will allow designing the crosshatch angle for optimum mechanical performance is disclosed. Instead of the use of motors, cams and guide ways to drive the oscillation of the texture rollers, an electromechanical vibrator is used to force a beam, to which the texture rollers are attached, to oscillate at a specified frequency and amplitude.

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Crosshatched Zone Texture for Magnetic Disks

      A means of crosshatching the texture in the S/S zone that will
not only meet the tolerance requirements but will allow designing the
crosshatch angle for optimum mechanical performance is disclosed.
Instead of the use of motors, cams and guide ways to drive the
oscillation of the texture rollers, an electromechanical vibrator is
used to force a beam, to which the texture rollers are attached, to
oscillate at a specified frequency and amplitude.

      The Figure shows the disk 1 that is being textured in the stop
start zone 2 by the recessed rollers 3 on to which a free abrasive
tape 4 is attached.  The roller assembly is attached to a cantilever
beam 5 which is force to vibrate at by a electromechanical device 7.
The amplitude of the vibration can be as small as 30 to 100 microns.
This small amplitude of vibration will detract an insignificant
amount to the positional tolerance of the S/S zone.  An equation
which governs the mechanics of the crosshatch texture process is
given below.

      +-------------------------------------------------------------+
      |theta = tan sup -1 left lb <nu sub < osc > @ A sub < o >>    |
      |          over < N sub < rpm > @ R > right rb                |
      +-------------------------------------------------------------+
 where,

      theta =  half crosshatch angle, (degrees)

      nu sub <ocs> =  oscillation frequen...