Browse Prior Art Database

Thermoplastic Tape Readout System

IP.com Disclosure Number: IPCOM000092676D
Original Publication Date: 1967-Feb-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Hart, DM: AUTHOR

Abstract

In detecting data stored in topographical form such as is on thermoplastic tape 1, a beam of electrons 2 is directed from electron gun 3 onto the topographic target. Mesh 4 is biased at a positive potential to form an electric field. The latter attracts low-energy secondary electrons which are backscattered at a magnitude responsive to the slope of the data track. These secondary electrons strike electrically biased scintillator 5 which is coupled to photomultiplier 6 for reading the signal. To increase the signal-to-noise ratio and slope discrimination, the target is surrounded by perforated shield 7 to form a field-free region 8 directly over the target. Shield 7 allows secondary electrons 9 to take a direction determined only by the slope of the surface before being attracted by the field of Mesh 4.

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Thermoplastic Tape Readout System

In detecting data stored in topographical form such as is on thermoplastic tape 1, a beam of electrons 2 is directed from electron gun 3 onto the topographic target. Mesh 4 is biased at a positive potential to form an electric field. The latter attracts low-energy secondary electrons which are backscattered at a magnitude responsive to the slope of the data track. These secondary electrons strike electrically biased scintillator 5 which is coupled to photomultiplier 6 for reading the signal. To increase the signal-to-noise ratio and slope discrimination, the target is surrounded by perforated shield 7 to form a field-free region 8 directly over the target. Shield 7 allows secondary electrons 9 to take a direction determined only by the slope of the surface before being attracted by the field of Mesh 4. Secondary electrons 10, back-scattered from the opposite sides of the track, travel out of the influence of the mesh 4 field and therefore do not contribute to the signal.

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