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Servo Pattern for Measuring Position Error in Tape Systems

IP.com Disclosure Number: IPCOM000082352D
Original Publication Date: 1974-Nov-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Wong, KY: AUTHOR

Abstract

A magnetic head is made to follow a record path by use of prerecorded servo tracks. A pattern of two triangular strips 10 are registered repeatedly along the edges of a longitudinal tape 12. The number of pulses read by the head, as it traverses the triangular patterns, indicates the distance of the head from the base of the triangle being read. This pulse count provides an indication of head position error and skew angle, which may then be corrected.

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Servo Pattern for Measuring Position Error in Tape Systems

A magnetic head is made to follow a record path by use of prerecorded servo tracks. A pattern of two triangular strips 10 are registered repeatedly along the edges of a longitudinal tape 12. The number of pulses read by the head, as it traverses the triangular patterns, indicates the distance of the head from the base of the triangle being read. This pulse count provides an indication of head position error and skew angle, which may then be corrected.

The patterns may be written by inclining a write head at an angle relative to the width of the tape and using two erase heads at right angles to the write head. To form the desired pattern, write current is turned on, and then turned off while the erase current is used.

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