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Discrete Track Magneto Optic Recording

IP.com Disclosure Number: IPCOM000093501D
Original Publication Date: 1967-Oct-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Beck, JW: AUTHOR

Abstract

This magneto-optic tracking system is for reading and recording information on a memory element 1 in which preferred tracking lines 2 and 3 are formed on the memory element to define intermediate data tracks 4. The tracking system centers the recording or reading spot 5 on the data track. This is effected by reacting to the change in beam intensity on the opposite side of the element if the tracking lines are opaque as down, or on the reflecting side if the tracking lines are reflective. The direction of adjustment of the track of the beam is determined by encoding the edges 6 and 7 of the tracking lines. This is achieved with higher and lower frequency undulations to signal the tracking mechanism the lateral direction in which the beam has deviated.

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Discrete Track Magneto Optic Recording

This magneto-optic tracking system is for reading and recording information on a memory element 1 in which preferred tracking lines 2 and 3 are formed on the memory element to define intermediate data tracks 4. The tracking system centers the recording or reading spot 5 on the data track. This is effected by reacting to the change in beam intensity on the opposite side of the element if the tracking lines are opaque as down, or on the reflecting side if the tracking lines are reflective. The direction of adjustment of the track of the beam is determined by encoding the edges 6 and 7 of the tracking lines. This is achieved with higher and lower frequency undulations to signal the tracking mechanism the lateral direction in which the beam has deviated. The frequencies of the edge modulations can also be used to define either bit or byte spacings or both.

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