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Browse Prior Art Database

Non Destructive Readout Of Eccentric Cores

IP.com Disclosure Number: IPCOM000096835D
Original Publication Date: 1963-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Shevel, WL: AUTHOR [+2]

Abstract

Ferrite cores 5 and 6 have eccentrically located apertures 7 and 8. Readin is accomplished by bringing permanent magnets 9 and 10 into close proximity with cores 5 and 6 and then removing them. The north pole of magnet 9 is located adjacent core 5, resulting in the readin of a 1. The south pole of magnet 10 is adjacent to core 6, resulting in the readin of a 0.

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Non Destructive Readout Of Eccentric Cores

Ferrite cores 5 and 6 have eccentrically located apertures 7 and 8. Readin is accomplished by bringing permanent magnets 9 and 10 into close proximity with cores 5 and 6 and then removing them. The north pole of magnet 9 is located adjacent core 5, resulting in the readin of a 1. The south pole of magnet 10 is adjacent to core 6, resulting in the readin of a 0.

Readout is accomplished by first applying a prime pulse to the drive windings of cores 5 and 6. The prime pulse is selected to be less than that required to completely switch all of the flux in the core. secondly, a pulse is applied on the drive windings in the opposite direction to the prime pulse. This pulse is also insufficient to switch the core.

An output signal is derived at the sense windings each time the prime and drive signals are applied. The magnitude of the output signal depends upon the orientation of magnets 9 and 10. Reapplication of the prime and drive pulses produces additional output signals. In this manner, cores 5 and 6 can be sensed a number of times without destroying the information stored during the readin operation.

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