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Write Wide, Read Narrow Magnetic Head

IP.com Disclosure Number: IPCOM000096975D
Original Publication Date: 1962-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Rogers, FL: AUTHOR

Abstract

To overcome difficulties arising from misalignment, the magnetic head 1 reads narrower than it writes. Head 1 includes O-shaped core 2 having read and write windings 3 and 4 on legs 5 and 6, respectively. Legs 5 and 6 form a gap 7 across which flux is passed during read and write operations. A pair of magnetic members 8 and 9 is disposed in gap 7 extending between outer portions 10 and 11 of core 2. These portions are insulated magnetically from main body 12 by portions 13 and 14.

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Write Wide, Read Narrow Magnetic Head

To overcome difficulties arising from misalignment, the magnetic head 1 reads narrower than it writes. Head 1 includes O-shaped core 2 having read and write windings 3 and 4 on legs 5 and 6, respectively. Legs 5 and 6 form a gap 7 across which flux is passed during read and write operations.

A pair of magnetic members 8 and 9 is disposed in gap 7 extending between outer portions 10 and 11 of core 2. These portions are insulated magnetically from main body 12 by portions 13 and 14.

During write operations, the flux across gap 7 is greater than the flux required to saturate members 8 and 9. The excess flux, therefore, passes along the whole length of gap 7, effective to write information on record medium 15.

When reading information, the relative movement between head 1 and medium 15 causes a change of flux in core 2 and across gap 7.

This flux magnitude, however, is lower than the saturation flux of members 8 and 9. Accordingly, the length portions of the gap coextensive with members 8 and 9 are magnetically shortcut. Substantially no flux appears along these portions. Thus, the head reads only the middle portion of the information track. To facilitate long life of the head, members 8 and 9 are disposed in the gap remote from pole face 16. The width of the gap is maintained by a filling 17 of non-magnetic, adhesive material.

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