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METHOD OF FORMING ALIGNMENT DISK

IP.com Disclosure Number: IPCOM000022804D
Original Publication Date: 1976-Feb-29
Included in the Prior Art Database: 2004-Mar-26
Document File: 2 page(s) / 248K

Publishing Venue

Xerox Disclosure Journal

Abstract

A method of forming an alignment disk to be used for aligning an electromagnetic head at a known radius relative to a magnetic recording disk. The method comprises the steps of setting a master head at the known radius, rotating the alignment disk eccentrically relative to the master head, recording by the master head two tracks on the alignment disk on either side of the known radius wherein the tracks are displaced from each other a distance equal to the desired width of a

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XEROX DISCLOSURE JOURNAL

METHOD OF FORMING ALIGNMENT DISK
W~ B~, Watson

Proposed Classification
U.S. Cl. 315/1

Int. Cl. HOlj 23/34

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   MARK
ALIGNMENT

I

OSCILLOSCOPE DISPLAY

A method of forming an alignment disk to be used for
aligning an electromagnetic head at a known radius

relative to a magnetic recording disk. The method
comprises the steps of setting a master head at the
known radius, rotating the alignment disk eccentrically
relative to the master head, recording by the master
head two tracks on the alignment disk on either side of
the known radius wherein the tracks are displaced from
each other a distance equal to the desired width of a

single track and the frequency of data on each track is
slightly different, rotating the alignment disk
concentrically relative to the master head with the
head being located at the known radius, electronically
determining a zero crossing in the composite waveform
readable by the master head as the disk is rotated
concentrically with the head located at the known
radius, and erasing a segment of the composite
waveform intersecting the zero crossing in order to
form an alignment mark on the disk,

Volume 1 Number 2 February 1976 75

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76 ~ROX DISCLOSURE JOURNAL

Volume 1 Number 2 February 1976

[This page contains 1 picture or other non-text object]