DE1062036B

DE1062036B - Process for the production of magnetic memory or switching matrices

Info

Publication number: DE1062036B
Application number: DET14705A
Authority: DE
Inventors: Dr-Ing Sigfrid Schweizerhof
Original assignee: Telefunken AG
Current assignee: Telefunken AG
Priority date: 1958-02-06
Filing date: 1958-02-06
Publication date: 1959-07-23
Also published as: NL113479C; US3099874A; FR1212618A; GB871796A; NL235768A

Description

DEUTSCHESGERMAN

Die Erfindung bezieht sich auf Matrixanordnungen zur magnetischen Speicherung oder Übertragung von Informationen, wie sie z. B. in elektronischen Rechenmaschinen, elektronischen Wählanlagen, elektronischen Zuordnern und ähnlichen Einrichtungen verwendet werden.The invention relates to matrix arrangements for magnetic storage or transmission of Information such as B. in electronic calculating machines, electronic dialing systems, electronic Mappers and similar facilities are used.

Eine bereits allgemein bekannte Matrix dieser Art besteht aus einer regelmäßigen gitterförmigen Anordnung kleiner Ferrit-Ringkerne, die von einem System sich in den Ringen kreuzender Drähte, z. B. Schreib-, Lese- und Inhibitordrähte, durchflochten ist. Die Arbeitsweise eines Ferrit-Ringkernes mit rechteckförmiger Hystereseschleife als Speicher oder Schaltelement kann hier als bekannt verausgesetzt werden, ebenso wie die Arbeitsweise und Verdrahtung einer aus solchen Elementen aufgebauten Matrix. Solche Matrizen arbeiten bereits sehr zufriedenstellend; sie sind jedoch sehr teuer. Der hohe Preis rührt vor allem von der zeitraubenden und nur schwer zu vereinfachenden Durchfädelung der verschiedenen Drähte her und von einem relativ hohen Ausschuß infolge Beschädigung einzelner schon eingefädelter Ringkerne. Aus dem letztgenannten Grunde ist auch die Herstellung solcher Matrizen oberhalb einer gewissen Größe (z. B. 32 · 32 Kerne) unwirtschaftlich. Einer wesentlichen Verkleinerung solcher Matrizen, wie sie von der allgemeinen technischen Weiterentwicklung verlangt wird, ist eine praktische Grenze gesetzt, die bald erreicht sein dürfte.An already well-known matrix of this type consists of a regular grid-like arrangement small ferrite toroidal cores, which are formed by a system of wires crossing each other in the rings, e.g. B. writing, Read and inhibitor wires, is braided. How a ferrite toroidal core works with a rectangular Hysteresis loop as a memory or switching element can be assumed to be known here, as well as the operation and wiring of a matrix made up of such elements. Such Matrices are already working very satisfactorily; however, they are very expensive. The high price is the main thing from the time-consuming and difficult to simplify threading of the various wires and from a relatively high reject rate due to damage to individual toroidal cores that have already been threaded. the end The last-mentioned reason is also the production of such matrices above a certain size (e.g. 32 · 32 cores) uneconomical. A substantial reduction in the size of such matrices, like those of the general one technical development is required, a practical limit is set that will soon be reached should be.

Eine andere, ebenfalls bereits bekannte Matrixform ist die einer durchlöcherten Platte aus einem Ferrit mit rechteckförmiger Hystereseschleife. Durch das Lochsystem einer solchen Platte wird — wie bei der Ringkern-Matrix — ein System von mehreren Drähten durchgefädelt. Diese Matrixanordnung stellt einen gewissen technischen Fortschritt gegenüber der Ringkern-Matrix dar: Sie ist robuster gegenüber dem üblichen Verdrahtungsprozeß. Die Verdrahtung läßt sich auch fotochemisch aufdrucken, jedoch ist der Aufwand für dieses Verfahren nur bei sehr hohen Stückzahlen lohnend. Die Löcher einer Matrixplatte können leicht kleiner gehalten werden als bei der Ringkern-Matrix. Der für die magnetische Umschaltung der Lochumgebung erforderliche Stromimpuls kann daher verkleinert werden, was für den Betrieb mit Transistoren von Vorteil ist. Zugleich mit den Löchern verkleinert sich auch die Matrixfläche und damit der Platzbedarf des Speichers oder Schalters. Als Nachteile der Matrixplatte sind das immer noch erforderliche Drahtdurchfädeln zu betrachten und die beträchtlichen Kosten eines Preßwerkzeugs für eine große Zahl von kleinen Löchern.Another matrix form, also already known, is that of a perforated plate made of a ferrite with rectangular hysteresis loop. As with the Toroidal matrix - a system of several wires threaded through. This matrix arrangement represents one represents a certain technical progress compared to the toroidal core matrix: It is more robust compared to the usual wiring process. The wiring can also be photochemically printed, but the effort involved for this process only worthwhile with very high quantities. The holes of a matrix plate can can be kept slightly smaller than with the toroidal core matrix. The one for magnetic switching The current pulse required by the hole environment can therefore be reduced, which is essential for operation with Transistors is beneficial. At the same time as the holes, the matrix area and thus the Space requirement of the memory or switch. These are still required as disadvantages of the matrix plate Consider wire threading and the considerable cost of a crimping tool for large numbers of small holes.

Es ist auch bereits bekannt, das Durchfädeln der Drähte durch die Löcher einer Matrixplatte zu um-It is also already known to thread the wires through the holes of a matrix plate.

Verfahren
zur Herstellung von magnetischen
Speicher- oder Schaltmatrizenprocedure
for the production of magnetic
Storage or switching matrices

Anmelder:
Telefunken G.m.b.H.,
Berlin NW 87, Sickingenstr. 71Applicant:
Telefunken GmbH,
Berlin NW 87, Sickingenstr. 71

Dr.-Ing. Sigfrid Schweizerhof, Backnang (Württ),
ist als Erfinder genannt wordenDr.-Ing. Sigfrid Schweizerhof, Backnang (Württ),
has been named as the inventor

gehen, indem man die Drähte von vornherein in die Platte einpreßt, ähnlich wie bei dem ebenfalls bereits bekannten Verfahren, die Wicklung von Drosselspulen mit einer Hochfrequenzeisenmasse zu umspritzen. Ein weiterer Vorteil dieses Verfahrens soll in der unmittelbaren Umhüllung der stromführenden Drähte und in der damit verbundenen weiteren Verminderung des erforderlichen Schreib- oder Schaltstromimpulses liegen. Dieses Verfahren stößt nun jedoch in der Praxis auf ganz erhebliche Schwierigkeiten, so daß es als praktisch undurchführbar betrachtet werden muß. Abgesehen davon, daß es preßtechnisch sehr schwierig ist, das komplizierte Verdrahtungssystem mit seinen zahlreichen Zuführungen in das Ferritpulver einzupressen, hat eine aus Ferritpulver gepreßte Platte nicht die erforderlichen magnetischen Eigenschaften. Die Magnetisierungskurve einer solchen gepreßten Ferritplatte ist nämlich infolge der unvermeidlichen inneren Scherung keineswegs rechteckförmig, wie es für Speicher- und Schaltzwecke unbedingt erforderlich ist. Eine magnetisch günstig wirkende Nachsinterung einer solchen Platte mit eingepreßter Verdrahtung ist andererseits praktisch ausgeschlossen, denn infolge der hohen Sintertemperatur würde die Isolation der Drähte verlorengehen, wenn diese durch chemische Reaktionen nicht völlig zerstört werden.by pressing the wires into the plate from the start, similar to the one already done known method to encapsulate the winding of inductors with a high-frequency iron mass. A Another advantage of this method is said to be in the immediate encasing of the current-carrying wires and in the associated further reduction in the required write or switching current pulse. However, this method now encounters very considerable difficulties in practice, so that it as must be considered practically impracticable. Apart from the fact that it is very difficult to press is to press the complicated wiring system with its numerous feeds into the ferrite powder, a sheet pressed from ferrite powder does not have the required magnetic properties. Namely, the magnetization curve of such a pressed ferrite plate is inevitable due to the inner shear by no means rectangular, as it is absolutely necessary for storage and switching purposes is. A magnetically favorable re-sintering of such a plate with pressed-in wiring on the other hand is practically impossible because the high sintering temperature would reduce the insulation of the wires are lost if they are not completely destroyed by chemical reactions.

Es ist ferner ein Verfahren zur Herstellung einer magnetischen Speichermatrix vorgeschlagen worden, bei dem auf die Kreuzungspunkte des Verdrahtungssystems umhüllende Ferritperlen aufgesintert werden. Dies geschieht dadurch, daß die Kreuzungspunkte der Drähte zunächst mit einem Brei aus ferritbildenden Oxyden betropft werden und daß danach die gesamte Leiteranordnung zur Bildung der Ferritperlen auf die erforderliche Sintertemperatur erhitzt wird. Wie bereits aus obigen Ausführungen zu entnehmen ist, dürfteA method for producing a magnetic memory matrix has also been proposed, in which ferrite beads enveloping the crossing points of the wiring system are sintered. This is done by first covering the crossing points of the wires with a slurry of ferrite-forming compounds Oxides are dripped and that then the entire conductor arrangement to form the ferrite beads on the required sintering temperature is heated. As can already be seen from the above, should

909 578/218909 578/218

Claims

In practice, it will be extremely difficult, if not impossible at all, to protect the wires of the storage system from chemical or physical destruction at the required high sintering temperatures (e.g. about 1300 ° C.). The invention relates to a method for producing a mechanical memory or switching matrix, in which the disadvantages and production difficulties of the aforementioned arrangements and methods are avoided, and which at the same time enables small switching currents and a particularly economical production of matrices of large capacity. According to the invention, a magnetic layer, preferably a ferrite layer, is sprayed in the molten state or vapor-deposited from the gas phase on a prefabricated wiring system in the form of a fabric or network of insulated wires, in such a way that at least the storing or switching crossing points of the wires are on all sides the solidified magnetic layer are enveloped. With this method there is no need to heat the matrix wire mesh to high temperatures, so that the insulation of the wires or even the wires themselves are not endangered. In order to ensure a smooth, coherent covering of the crossing points and to prevent the ferrite from penetrating between the crossing wires, it is advisable to coat the wire matrix beforehand by painting, in particular dip painting, with a temperature-resistant paint, e.g. B. silicone varnish to cover. The vapor deposition of magnetic materials on surfaces is known per se and no longer presents any particular practical difficulties. With this method, the prefabricated wire matrix and its insulation are not endangered at all. The spraying of any kind of substrate with molten metals or ceramic substances is known per se and has already been used technically for certain applications. Suitable spray guns are available for this, in which the substances are introduced into the flame in the form of wire, rods or powder. For example, copper layers are sprayed onto ceramic surfaces and zinc layers onto the surfaces of paper capacitors. Even the spraying of quartz is already technically possible. When carried out appropriately, this process results in surprisingly compact, homogeneous layers, although the sprayed substrates only heat up relatively little, such as. B. the above case of paper capacitors clearly shows. In comparison with a plate pressed from ferrite powder, the density of a ferrite mass sprayed on in the manner according to the invention is so great that substantial internal demagnetization through pores does not occur, so that the required magnetic storage or switching capacity is achieved. Substantial damage to the insulation of the sprayed wire mesh can be avoided if the method is carried out appropriately and if a suitable temperature-resistant insulation layer (e.g. silicone layer) is used for the wires and the mesh, in contrast to the sintering of a wire mesh, in which the insulation is used today State of the art is destroyed. The method according to the invention has the following advantages:

1. The wire system of the matrix can be machined in the known type of metal mesh. This can be done in the form of a finished frame of any size with all the necessary connections or in the form of a larger tissue from which the desired matrix area is cut out will. This process is incomparably much more efficient than the usual threading through of the wiring, especially with large matrix areas.

ίο 2. The writing or switching wires are directly covered with the magnetic substance, in particular ferrite, and the wire thickness of the fabric can be kept very small in contrast to the threading process. The required switching current intensity can therefore be correspondingly small and facilitates operation with transistors.

3. The distance between the intersection points can be kept much smaller than with the previously known manufacturing processes. The space utilization (number of "bits" per cm ² area) is correspondingly greater. This advantage is of particular importance with regard to the further development of electronic calculating machines and automation.

4. A matrix with one or more damaged memory locations is when using the invention Process can be repaired, while repair is excluded in the previously known processes and the respective matrix is therefore lost.

The described method can be modified in various ways. For example, the wire mesh the matrix also to a smooth or profiled one produced by the usual pressing and sintering process Ferrite substrate and then sprayed with liquid ferrite from the top, so that it is completely tightly enveloped by the applied layer together with the ferrite base.

The method according to the invention is not restricted to planar matrices, but is permitted like the known ones Process also includes the production of differently shaped matrices, e.g. B. cylindrical arrangements.

Patentansprüche:Patent claims:

1. A method for producing a magnetic memory or switching matrix, characterized in that that a prefabricated wiring system in Form a fabric or network of insulated wires a magnetic layer, preferably a ferrite layer, sprayed on from the molten state or vapor deposited from the gas phase is, in such a way that at least the storing or switching crossing points of the wires on all sides be enveloped by the solidified, magnetic layer.

2. The method according to claim 1, characterized in that the prefabricated wiring system is placed on a sintered ferrite base and is sprayed from the top with liquid ferrite so that it is at least at the crossing points completely tightly encased by the applied layer together with the ferrite base will.

3. The method according to claim 1 and 2, characterized in that the wires of the wiring system are coated with a temperature-resistant insulation will.

4. The method according to claim 1 to 3, characterized in that the wire system of the matrix before spraying or steaming with one