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Browse Prior Art Database

Simultaneous Read Write Head

IP.com Disclosure Number: IPCOM000091443D
Original Publication Date: 1968-Feb-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Weidenhammer, JA: AUTHOR

Abstract

The two-gap head assembly permits a simultaneous read-after-write check while writing on circular track 2 of a disk file. The assembly permits a small spacing between read and write gaps 8 and 9 limited only by feed-through from gap 9 to gap 8. This gap spacing is made as small as possible to minimize tracking and skew errors for high-density disk recording. Shield 6 around read head core pairs 3, and shield 7 reduce feed-through between write core pairs 4 and core pairs 3. The core pairs can be made of any magnetic material such as iron or ferrite.

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Simultaneous Read Write Head

The two-gap head assembly permits a simultaneous read-after-write check while writing on circular track 2 of a disk file. The assembly permits a small spacing between read and write gaps 8 and 9 limited only by feed-through from gap 9 to gap 8. This gap spacing is made as small as possible to minimize tracking and skew errors for high-density disk recording. Shield 6 around read head core pairs 3, and shield 7 reduce feed-through between write core pairs 4 and core pairs 3. The core pairs can be made of any magnetic material such as iron or ferrite.

The head assembly can be mounted in air bearing shoe 5 with gaps positioned in tandem along track 2. Core pairs 3 and 4 are not co-planar, but are mounted at opposing oblique angles, so that a large angle, such as 90 degrees, exists between the planes of the two cores as shown in section A-A. The two heads are not only tilted in different planes, but are also skewed relative to the recording track. Hence core pairs 3 and 4 are positioned at a compound angle so that the recorded bits can be recorded in a generally radial orientation along track 2.

This angular core pair arrangement permits overlapping of gaps 8 and 9 so that considerably reduced gap separation can be obtained for a given size of magnetic structure. Also, signal feed-through is reduced by virtue of the relative orientation of the read and write magnetic circuits which are in quadrature rather than in parallel. In addition, t...