Browse Prior Art Database

Magnetic Pattern Viewer

IP.com Disclosure Number: IPCOM000097347D
Original Publication Date: 1962-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Steingrandt, WJ: AUTHOR

Abstract

The device continuously displays a sequence of images recorded on a magnetic tape without having the magnetic-developing medium contaminate the tape surface.

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Magnetic Pattern Viewer

The device continuously displays a sequence of images recorded on a magnetic tape without having the magnetic-developing medium contaminate the tape surface.

The system includes plastic belt 11 which passes around two pulleys 12 and
13. Magnetic tape 10 is received between the surface of pulley 13 and belt 10. Tape 10 is provided from a supply reel, not shown, to a takeup reel, not shown. Belt 11 is wider than tape 10, and the excess width of 11 extends on both sides beyond the edges of the tape 10.

A rolling applicator 17 has its lower portion submerged in magnetic fluid 18 held in container 16. The upper portion of applicator 17 engages the outer surface of belt 11. Applicator 17 is rotated by movement of belt 11.

Fluid 18 comprises a liquid medium having suspended in it tiny magnetic particles, such as the magnetic oxide used in the manufacture of magnetic tape. As applicator 17 rotates, a thin film of fluid with magnetic particles adheres to the non-magnetic surface of applicator 17 as its surface leaves fluid 18. The film is transferred to the outer surface of belt 11 as it is contacted by applicator 17.

The particles in the fluid film on the plastic surface distribute themselves according to the magnetic image on tape 10. The magnetic particles are thus always separated from the magnetic tape 10 by belt 11 and cannot contaminate tape 10. The excess width of belt 11 prevents particles from passing around the edges of 11 to tape 10 or...