DE1117165B - Magnetic storage - Google Patents

Description

The invention relates to a magnetic memory with at least one wire-shaped body made of magnetic material with a rectangular hysteresis loop, which is arranged at discrete intervals with different Control ladders is coupled.

Such a memory, which is also referred to as a "twistor", is z. B. described in the »Bell System Technical Journal ”, November 1957, pp. 1319 to 1340, and can be used with calculating machines or automatic signal systems for storing binary number signals in the form of certain characteristic ones Magnetization states of certain parts of the wire in the vicinity of the coupling points with the tax officers. The wire can e.g. B. be twisted, creating internal mechanical stresses in the material are generated and a preferred direction of magnetization in the material arises, which according to Helical lines run, the slope of which forms an angle of 45 ° with the wire axis. Since the magnetization So has a component perpendicular to the wire axis, this is by means of a current through the Wire itself changes, and conversely, when the magnetization changes, an induction voltage becomes generated in the longitudinal direction of the wire. The wire can optionally also with a certain Slope be wound on a core made of electrically conductive material. Such storage facilities have the advantage over devices with annular cores that the coupling with the Control conductors can be made more easily in the factory, e.g. by winding around the magnetic Wire or by the fact that the control conductors cross the magnetic wire vertically at a short distance and in the case of the ring-shaped cores, the control conductor must be inserted through the opening in the core, which is particularly important with the usual small dimensioning of these cores without damaging the insulation the tax manager is not easy.

Saving information on certain parts of the wire near the control ladder can be z. B. be done in that a pulse is fed to the wire and certain control conductors at the same time, which is so strong that the current flowing through the wire and the control conductors is in itself insufficient is to change the magnetization in the wire because the magnetic field strength here is below the Value of the coercive force remains. At the coupling points with control conductors to which the pulse is fed on the other hand, the magnetization is changed, because it is there under the total effect of the two impulses the coercive force is exceeded. If the coupling points with the control ladders are proportionate Magnetic storage

Applicant:

NV Philips' Gloeilampenfabrieken,
Eindhoven (Netherlands)

Representative: Dr. rer. nat. P. Roßbach, patent attorney, Hamburg 1, Mönckebergstr. 7th

Claimed priority:
The Netherlands of February 26, 1959 (no.236 551)

Wijnand Johannes Schoenmakers, Eindhoven

(Netherlands),
has been named as the inventor

lie close together, which is desirable in order to keep the storage facilities as small as possible, there is a risk that if a pulse is applied to certain control conductors, there will also be a change in magnetization takes place in the vicinity of coupling points with other control conductors because the magnetization progresses too far in the wire.

The invention eliminates this drawback.
According to the invention, short-circuit conductors are arranged at discrete intervals around the magnetic wire.

The drawing shows schematically a matrix memory with a number of wires Ml, M2 and M 3 made of electrically conductive magnetic material with a rectangular hysteresis loop. A number of control conductors Bl, B 2 and B 3 is so coupled by windings W U, W 12, W 21 with the different magnetic wires. The magnetic wires are twisted in a known manner, as a result of which, as mentioned above, a preferred direction of magnetization is created which forms an angle of approximately 45 ° with the axis of the wires. At the different points of one and the same wire in the vicinity of the couplings with the different control conductors, dual number signals can be stored independently of one another in that these points are brought into a certain characteristic magnetization state, which can be done in a known manner by simultaneously using the magnetic wire and the

109 739/278

a pulse is applied to the relevant control conductors. The signals can be read, for example, by sending a pulse in the opposite direction to a magnetic wire is fed, with the places where the information is stored in opposite directions Direction are magnetized and a pulse in the coupling windings coupled to these points is produced.

In this device one encounters the difficulty that when z. B. B 2 and the magnetic DrahtM 1 W 12, a latch pulse is fed to the conductor for storing information in the vicinity of the coupling winding, while the conductors Bl and S3 no pulses are supplied, as a result of the winding W 12 by current flowing though a certain influence the magnetization of the wire in the vicinity of the windings W 11 and W 13 takes place because the field change propagates over a certain distance along the wire. To remedy this, electrical short-circuit rings K 11, K 12, £ 21, etc. are arranged around the magnetic wires according to the invention between the coupling points of the magnetic wires with the control conductors. If a change in magnetization occurs in the vicinity of these short-circuit rings, a current is induced in the rings, the direction of which is such that the change in magnetization is counteracted, which prevents the change in magnetization from extending beyond the rings.

Claims (1)

PATENT CLAIM: Magnetic memory with at least one wire-shaped body made of electrically conductive magnetic material with a rectangular hysteresis loop, which is coupled at discrete intervals to various control conductors, characterized in that short-circuit conductors are arranged at discrete intervals around the body. Legacy Patents Considered:
German patent No. 1098536. 1 sheet of drawings © 109 739/278 11.61