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Browse Prior Art Database

Unbiased Erasure

IP.com Disclosure Number: IPCOM000092529D
Original Publication Date: 1966-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Ambrico, LE: AUTHOR

Abstract

Presently, digital tape is DC erased in such a direction that the magnetic effect of the erase head is in opposition to one of the data bits recorded. This is a disadvantage since it is a source of read-back asymmetry. The head shown erases the tape in a direction, perpendicular to the bits recorded on the tape. Therefore the contribution to read asymmetry is negligible.

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Unbiased Erasure

Presently, digital tape is DC erased in such a direction that the magnetic effect of the erase head is in opposition to one of the data bits recorded. This is a disadvantage since it is a source of read-back asymmetry. The head shown erases the tape in a direction, perpendicular to the bits recorded on the tape. Therefore the contribution to read asymmetry is negligible.

Erase head 10 is provided with erase winding 12 which, when energized, causes a flux to flow in head 10. Keeper 14 is located so that magnetic recording tape 16 passes between head 10 and keeper 14. When head 10 is energized by passing a current through coil 12, a flux is generated in head 10.

The flux leaves the left pole piece 18, passes through tape 16 and into keeper 14. The flux passes through keeper 14 back through tape 16 and enters the right pole piece 20 thus completing the flux path. This arrangement causes the erasing flux to pass through tape 16 perpendicular to the direction in which data bits are written.

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