Browse Prior Art Database

Writing On Magnetic Media

IP.com Disclosure Number: IPCOM000097304D
Original Publication Date: 1962-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Hickerson, JE: AUTHOR

Abstract

(Image Omitted) Bits of information are written on a magnetic tape 1 by selective control of heads 2...5. Each head 2...5 has a permanent magnet 6 and a soft iron interposer 7.

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Writing On Magnetic Media

(Image Omitted)

Bits of information are written on a magnetic tape 1 by selective control of heads 2...5. Each head 2...5 has a permanent magnet 6 and a soft iron interposer 7.

Each head also has a switching element 8 for switching the head on or off. When element 8 is positioned as shown, head 2 is off and most of the flux from magnet 6 travels through the upper portions of head 2 and through element 8. At this time, minimum flux circulation occurs in the lower portion of head 2 through the pole pieces. This permits easier positioning of interposer 7.

To write on tape 1 with head 2, interposer 7 is positioned under control of a keylever or other mechanism, not shown. Element 8 is subsequently rotated to the position indicated by dashed outline 9 in order to switch head 2 on. Thus, element 8 also insures precise timing of the write operation. A 0 is written if interposer 7 is in the position shown (lower flux path open). A 1 is written if interposer 7 is moved to the position indicated by dashed outline 10 (lower flux path closed).

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