DE1253761B - Magnetic storage - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

GlIc

German class: 21 al - 37/60

Number: 1253 761

File number: T 28374 EK c / 21 al

Filing date: April 12, 1965

Opened on: November 9, 1967

The invention relates to a magnetic memory in which numerous wire lengths with a thin Magnetic film are coated and form information lines, as well as numerous drive lines too are united in a fabric.

The aim of the invention is to prevent mutual interference from adjacent ones in such memories To prevent storage spaces.

In particular, the invention aims at this mutual interference between adjacent Prevent memory locations by using a back emf caused by in each word line flowing driving current is generated, so that an increase in storage density and a decrease in size of the memory is enabled.

According to the invention, in a magnetic memory of the type specified above, there is in the vicinity of each word line at least one first coil formed by warp wire for generating an induced voltage and at a certain distance from the first coil between it and an adjacent one Word line arranged at least one second coil, wherein the first and the second coil so wound and are connected to one another in such a way that at each memory location the direction of one of the The magnetic field generated by the current flowing through the first coil corresponds to that of the current generated by one through the word line flowing driving current generated magnetic field is opposite.

The essence and details of the invention will be apparent from the detailed description below reference is made to the drawings in which like numerals are used Designate parts. In the drawings shows

F i g. 1 in a plan view a fabric of weft and warp lines,

F i g. 2 on a larger scale schematically shows the relationship between the information lines and the Word lines,

F i g. 3 shows in a plan view the structure and details of a used in an experiment Memory,

Fig. 4 graphically shows the results of this experiment;

F i g. 5 and 6 show schematic representations for an explanation of the inventive concept and

7 to 11 on a larger scale schematically in plan view the essential arrangement of preferred Embodiments of the memory according to the invention.

The memory according to the invention is of the type shown in simplified form in FIGS. 1 and 2. The The outer surface of a wire 1 is covered with a thin magnetic memory

Applicant:

Toko Kabushiki Kaisha, Tokyo

Representative:

Dr.-Ing. E. Maier, patent attorney,
Munich 22, Widenmayerstr. 5

Named as inventor:

Hisao Maeda,

Akira Matsushita, Tokyo

Claimed priority:

Japan April 11, 1964 (20387)

magnetic film 2, ζ. Β. made of permalloy, coated, its preferred magnetic direction in the circumferential direction lies. This film 2 is applied, for example, by electrolytic deposition. Numerous Lengths of the thus obtained wire 3 coated with the magnetic thin film, which as Magnet wire can be referred to, along with numerous lengths of wire 4 too united in a fabric in which the various wires are isolated from one another and from one another cross.

In this tissue the magnet wire lengths are used as information lines and those in suitable Wire lengths 4 arranged at intervals are used as word lines. To enter a word, a drive current is conducted through a word line and a digit stream is conducted through an information line. In this way, information is displayed in the form of a binary "1" or "0" at the intersection of the both lines entered into the thin magnetic FUm. To read the stored information a driving current for reading is passed through the word line, so that in the information line an output voltage is generated.

Between the horizontal wires 3, which act as weft wires in the manufacture of the fabric and the vertical wires, which act as warp wires, can be used in the manufacture of the Of course, spacer wires are woven into the fabric. To enlarge the output you can

709 6S7 / 291

3 4

furthermore the ends of different wires to coils The induced voltage ν increases inversely pro-

connected with one or more turns are proportional to the distance χ from the word line W ab.

the. For example, according to Fig. 2, two adjacent one can assume that the voltage in one

bated lengths of four lengths of wire 4 with-relation to the number of electric power-

each other to a line consisting of two windings 5 lines, which through the crossing points between

Coil connected, which surrounds the magnet wires 3. each of the coils S ₁ , S ₂ , etc. and the magnet wires 3

Since the magnet wires go through in their longitudinal direction.

continuously covered with the magnetic film. Referring to FIG. 5 assume

are and crossed by numerous word lines that part of the generated by the current / _w

can be, with very small distances between io magnetic flux in a direction indicated by the arrow a

the word lines a mutual interference of indicated size through a coil S through

adjacent storage locations occur. and induces a voltage ν in this. if

For example, in FIG. 2 the distance between then through the coil S a current i in the vicinity of the two word lines W ₁ and W _{2 is} very large. Direction is guided and a magnetic force-If, however, in a memory location P ₂ a flow is generated which has the direction b and the partial information is stored and an information flow α is opposite, the flow of forces lift into an adjacent one Storage space F ₁ in this area on each other. As a result, the magnetic flux, which is almost no flux in this area, exerts a certain amount of force _{on the area of P 2} due to the driving current I _w in the word line W ₁ that a disturbance between adjacent ones is generated 20 memory locations can be prevented. The off-effect, as indicated by the arrows. Use of this state to prevent the _{mutual interference between adjacent information items stored in storage space P 2} is weakened, or information placed in the opposite storage spaces is reversed, which is an important feature. As a result, the invention is.

the output is weakened or an error occurs. 25 Another important feature of the invention

permanent function. This mutual disturbance leads to the exploitation of one caused by the driving

Difficulties also arise when the voltage induced by the word current is used to generate the

line repeats a driving current for reading countercurrent in the coil S. This feature of the

leads to in a system with nondestructive invention is shown in FIG. 6 explained. After that are one

Reading information to store or stored 30 coil S ₀ arranged in the vicinity of the word line W

Read information. for generating an induced voltage and a

Therefore, the spaces between the memory lines may be spaced apart from / from the word line

burst P not be too small. This requirement er coil S connected to one another. The in the coil S ₀

The miniaturization of the memory is difficult. So far, the voltage induced by the driving current I _{w is}

the electrically required distances between 35 were used to generate a current flow i in in the coil S

see the word lines by interposing a direction to generate the drive current I _w

Maintained by spacer wires. is opposite (in terms of the direction of the

To study the magnetomotive force exerted on the drive current back on the magnet wire 3

supplying magnetic flux distribution was rischen force), so that a magnetic flux b

within the scope of the invention with a fabric that is 4 ° in the opposite direction,

The following experiment shown in Fig. 3 by- In this case the driving current I _{w naturally induces-}

led: For the shot, nine lengths were also lent in the coil S a voltage that was lower

Magnet wire 3 used. This consisted of a is as the voltage in S ₀ . Strictly speaking, this is

Core made of phosphor bronze wire with a passage of the current / a combination of the in the spu-

diameter of 0.2 mm and an approximately 2 micron star S ₀ and S induced currents,

ken coating made of permalloy, which is electrolytically The distance I between the coils S ₀ and S is

Deposit had been generated. Chosen for the chain so that that generated by the driving current

an insulated wire with a diameter power flow distribution was used. Here is the

of 0.07 mm and intervals of V12 mm. Force flux density in the area of the coil S ₀ high and im

Of these warp wires, four were in contact with each other

neighboring wires to a word line W behind a high force flux density a strong voltage indu-

switched to another. Two adjacent chains each and in the area of the low force flux density

wires were on one side of the chain to each the magnetic flux is canceled,

connected to a coil S ₁ or S ₂ etc.

a turn existed. 55 rungsstelle with the coil S ₀ to a certain extent as well

Through the word line W , currents with a current flow i in the coil S _{0 were} reduced. Frequency of about 4 MHz and very high current, on the other hand, the magnetic flux of force is guided by the reinforcement of 800, 600 and 400 mA. For each contact part of the coil S by the in this flowing driving current were almost completely canceled for each of nine accumulators,
the induced in the coils S ₁ , S ₂ etc. burst. Preferred embodiments of the invention are voltages V ₁ , V ₂ etc. measured. The result is shown in FIGS. 7 to 11, in each of which only shown graphically in FIG. a few magnet wires 3 and word lines are shown

In Fig. 4, the distance λ: from are on the abscissa in order to facilitate understanding of the details.

the middle of the word line W (Fig. 3) and on the tern. In fact, of course, numerous ma-

Ordinate ν the 65 magnetic wires 3 and word lines induced in the coils S ₁ , S _{2 etc. are used.}

Voltage ν plotted. In all cases, Fig. 7 shows an arrangement in which on each

Peak values indicated, with the drive current I _w as the side of each word line W a combination of

Parameter is taken. a coil S ₀ and a coil S is arranged. Between

see these coils S ₀ and S spacer wires 5 are arranged.

In the in F i g. 8, a common combination of the coils S ₀ and S is arranged between two word lines W ₁ and W _2. For the word line W ₁ , the coil S _{0 has} the function of the coil S ₀ described above, ie it generates an induced voltage. For the word line W ₂ , the coil S is used to generate an induced voltage and should therefore be referred to as S ₀ according to the notation originally used.

According to FIG. 9, a coil S ₀ is used between the coil turns of a single word line W to generate an induced voltage. This coil S ₀ is connected to coils S on both sides of the word line W. In the in Fi g. 10, the word line W consists of a coil of three turns. Between the turns of the word line W two coils S are ₀ ao arranged that are connected to a respective one of which is arranged on both sides of the word line W coils S.

Since in the arrangements according to FIGS. 9 and 10, the coils S _{0 increase} the spacing between the turns of the word conductor coils, a more uniform distribution of the force flow generated by the driving current is achieved, which in a force flow-path diagram approximately results in a rectangle. Since the conditions are largely constant, this device is particularly well suited for non-destructive reading.

As shown in the embodiment of the invention shown in FIG. 11, the distances between the coils S ₀ and S, which are assigned to the word lines W ₁ and W ₂ , can also be produced with conventional spacer wires.

Details, for example the combination, arrangement, number and circuit of the word lines, the coils S ₀ and S and the spacer wires can of course differ in various ways from the exemplary embodiments described above.

The invention eliminates the mutual interference of stored in adjacent memory locations Information using voltages induced in a word line by the driving current, which in turn cause currents that generate an opposing field. This makes it possible to use the To increase the storage density or to reduce the storage capacity.

Claims (1)

Claim: Magnetic memory with numerous wire lengths which are covered with a thin magnetic film, the preferred magnetic direction of which runs in the circumferential direction and which are used as information lines, as well as with numerous word lines, the information lines being arranged as weft elements and the word lines as warp elements in a fabric so that Information can be stored at each crossing point between the information and word lines, characterized in that in the vicinity of each word line at least one first coil (S ₀ ) formed by warp wire for generating an induced voltage and at a certain distance (Z) from the first coil between it and an adjacent word line at least one second coil (S) is arranged, wherein the first and the second coil are wound and connected to each other so that at each memory location the direction of one of the first coil (S ₀ ) flows through Generated electricity Magnetic field is opposite to that of the magnetic field generated by a drive current flowing through the word line. For this purpose 2 sheets of drawings 709 687/291 10.67 © Bundesdruckerei Berlin