JPS5927030B2 - magnetic bubble device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic bubble device, and particularly to a magnetic bubble memory that can perform writing and reading quickly, and even if a portion of a transfer path is defective, a normal portion other than the defective portion can be used.

A magnetic bubble device generates cylindrical magnetic domains (bubbles) on a magnetic plate with uniaxial anisotropy, such as a magnetic magnet, and propagates the bubbles along a propagation pattern on the magnetic plate to store and process information. It is.

T-bar, Chevron, half-disk, etc. have been proposed as propagation patterns using a rotationally driven magnetic field, and are also actually used. Figure 1 shows the propagation state of bubbles using half disks, 1a, 1b...
...... is a half disk type propagation pattern, 2 is a magnetic bubble, arrows 3a, 3b...
... indicates the direction of the rotational drive magnetic field HD. Drive magnetic field HD
As shown in FIG. 1, when facing in the direction of arrow 3a, magnetic poles are formed in portions 1a, Ibl, etc. of pattern 1a, Ib, and if bubble 2 is placed in these portions, the driving magnetic field will be the same at the next point in time. As shown in FIG. 2, when facing in the direction of arrow 3b, the magnetic poles are formed in portions 1a2, 1b2, etc., and the bubble 2 moves to the nearer magnetic pole 1b2. Next, as shown in FIG. 3, when the driving magnetic field is directed in the direction of the arrow 3c, magnetic poles are formed in the portions 1a3 and 1b3, and the bubble moves to the portion 1b3. Furthermore, as shown in FIG. 4, when the driving magnetic field is directed in the direction of arrow 3d, the magnetic poles are 1a4 and 1b.
4, etc., and bubble 2 moves to part Ib. Repeat this, pattern 1a, Ib, Ic...
...... will be transferred sequentially. This half-disk type pattern is essentially a serial type like the T, I patterns, etc., and the bubble memory composed of these patterns is written and read sequentially not only in the single-loop method but also in the major-minor method. It is difficult to write and read simultaneously in parallel. Particularly in the case of a single-loop system, if there is even one part of the bubble propagation path where bubble propagation is impossible or where the operating margin is extremely narrow, the entire system becomes unusable, resulting in poor manufacturing yield. By the way, as a known magnetic bubble element, there is an element called an idler. For example, as shown in FIG. 2, this idler consists of a disc-shaped magnetic pattern 4, and when a rotational driving magnetic field is applied to this and a bubble 2 is provided, the bubble 1 has a direction of the driving magnetic field of arrows 3a, 3b, 3c, 3d, it assumes the illustrated position, and rotates repeatedly around the magnetic pattern 4 as the driving magnetic field rotates. If two idlers are placed adjacent to each other and the direction of the driving magnetic field is suddenly reversed by 1800 degrees when the bubble comes to the part facing the idler, the bubble naturally tries to move to the opposite side, but it is too rapid to follow. On the other hand, the adjacent idlers have attractive magnetic poles, so the magnetic force will move to those sides. In other words, bubble propagation occurs instead of bubble circulation. By using such elements, gate circuits, memories capable of serial/parallel writing/reading, etc. can be easily constructed. The present invention focuses on this point, and is characterized in that a plurality of single magnetic patterns which normally operate as idlers depending on the rotational driving magnetic field are arranged adjacent to each other, and the magnetic patterns act on the magnetic patterns. The present invention is characterized in that a magnetic field generating device is provided that rapidly changes the direction of a driving magnetic field by 180 degrees to propagate magnetic bubbles between magnetic patterns.

This will be explained in detail below with reference to Examples. Third
The figure shows an embodiment of the present invention in which four disk-type idlers 4 are arranged in parallel.

5 is a magnetic field generator, which consists of two sets of X, . It consists of a known configuration such as a voltage and current control circuit including a Y coil and a switching element that supplies an excitation current with a desired waveform such as a sine wave or a triangular wave to the coil. However, in the present invention, the driving magnetic field direction is suddenly reversed by 180 degrees. It also has means to do so.

A simple means for this is a circuit that changes the timing of the opening/closing control signal of the switching element, but a coil and its excitation current supply device are separately provided, and the device allows current to flow through the coil to overcome the driving magnetic field and change its direction. It may also be inverted. With this device, the driving magnetic field HD is now
Assuming that the bubble 2 is oriented in the direction of the arrow 3a as shown in FIG.
When D rotates counterclockwise and faces the direction indicated by arrow 3b in FIG. 2, the bubble rotates 1/4 counterclockwise around the idler 4a and reaches the left end position in the figure, facing the adjacent idler 4b. come. At this time, a signal Sg is applied to the 1 drive magnetic field generator 5, and the drive magnetic field direction is suddenly changed from 3b to 3d.
Invert 800. As a result, bubble-absorbing magnetic poles are generated in portions 4a1, 4b1, etc. of idlers 4a, 4b, etc., and the bubble normally makes a 1/2 turn and tries to move to the magnetic pole 4a1 of the same idler 4a, but this switching is sudden. On the other hand, an attractive magnetic pole is generated at the opposing end 4b1 of the adjacent idler 4b, and this is closer, so the bubble 2 moves from the idler 4a to the position 4b1 of the idler 4b as shown in FIG. I will move on to Since the maximum transferable frequency of bubbles is about 1 MHz, the above switching can be performed in a short time of 1 μSec or less. Bubble propagation takes place in this way, and then the driving magnetic field 1 is returned to normal and rotated by 1/4 to take the direction of the arrow 3a in FIG.
Move to.

When the bubble 2 is further rotated by 1/4 in the direction of the arrow 3b in FIG. 5, the bubble 2 moves to a position 4b3 facing the next adjacent idler 4c. At this time, the signal Sg is applied again to generate the driving magnetic field H. When the bubble 2 is reversed by 1800 to take the direction of the arrow 3d, the bubble 2 moves to the idler 4c as shown in FIG.
The same goes for the following, and thus the bubble 2 is connected to the idler 4a~
4d and can be propagated as needed. By arranging a plurality of idlers not only in the horizontal direction but also in the vertical direction, bubble propagation in the vertical direction is also possible, and thus the device can be used as a distribution gate. Further, the idler is not limited to a disk, but may be of any shape such as an ellipse, a triangle, or a polygon. FIG. 4 shows an example in which the device of the present invention is used in a memory.

In this example, the idlers 4 are 11, 12, 13, 14, 21.
, 22, .
a, 6b, 7a, 7b
Propagation paths 6 and 7 using ・・・・・・・・・・・・・・・
A bubble generator 8 is provided at the input end, and a bubble expander 9 and a bubble detector 10 are provided at the output end. To explain the operation, when a bias magnetic field and a driving magnetic field are applied to this magnetic bubble memory as usual, and a current is applied to the bubble generator 8 to generate bubbles, the bubble pattern is generated every time the driving magnetic field rotates once. Half disk 6a, 6b
・・・・・・・・・・・・・・・ is propagated one by one.

If bubble generation is performed for each rotation of the driving magnetic field, when the driving magnetic field rotates four times, patterns 6a and 6b, 6b and 6e
, one between each opposite end of 6e and 6d, and 6d and 6e, total of 4
bubbles exist, and idlers 11, 12, 13, 1
You will be facing 4. 2a shows the first bubble.

If the direction of the driving magnetic field is reversed in this state, the bubbles will move to patterns 11, 12, 13, and 14 for the reason described above. 2b
indicates the first bubble in this state.

When the driving magnetic field is rotated by 1/2, the bubbles move to a position facing the patterns 21 to 24 in the next row, and in synchronization with this point, the bubble generator 8 generates one bubble per rotation of the driving magnetic field. When the driving magnetic field rotates four times, four bubbles are generated, and these bubbles form patterns 6a and 6b.
, 6b and 6c, 6c and 6d, and 6d and 6e. While this driving magnetic field rotates 4 times, patterns 11 to 14
The upper bubble simply rotates around the pattern the same number of times, and the four newly generated bubbles form pattern 6a.
When filling the opposing ends of ~6e, the bubbles on patterns 11-14 are in positions facing patterns 21-24. At this time, if the driving magnetic field is reversed again, patterns 6a-
The bubbles on 6e propagate onto patterns 11-14, and the bubbles on patterns 11-14 propagate onto patterns 21-24. Assuming that the input information is composed of 4 bits per word, the bubble generator 8 is activated (corresponding to ``1'') or not activated (6
0''), the bubble generator 8 sequentially generates each bit of each word, propagates it through the half-disk bubble propagation path 6, and transfers the 4 bits of each word to the memory elements arranged in 4 columns and 4 rows. On the output side, if there are bubbles in the patterns 41 to 44, the bubbles are simultaneously read out to the output side half disks 7a to 7d when the direction of the driving magnetic field is reversed, and then the driving magnetic field is When rotated in the usual manner, the bubbles are transferred one by one in half-disc patterns, stretched by a stretcher 9, detected, ie read out, by a detector 10, and converted from a magnetic signal to an electrical signal.

This memory has a single loop configuration with 4 idlers
Only the group parts are connected in parallel and in series, and the input section, output section, etc. are connected in series.

If the driving magnetic field is not reversed after writing to the idler section, the bubbles will simply circulate around the idler 4, and the information will be stored and retained in a distorted state. Of course, the driving magnetic field may be stored and held in a fixed state in one direction. In this memory, the bubble propagation paths are parallel in the idler 4 section, so even if there is a defect in a part and bubble propagation is impossible or difficult, that propagation path is not used (in terms of bits, bubbles are always generated in the bit). By not performing this process (leaving it at "O"), only the remaining portion with normal characteristics can be used, and thereby the manufacturing yield can be greatly improved.

This effect becomes more significant as the memory capacity increases. As explained in detail above, according to the present invention, a unique bubble propagation path using an idler is obtained, and when used in a memory, writing and reading can be performed quickly in parallel. Various advantages such as higher yield can be obtained〇

[Brief explanation of drawings]

1 to 4 are explanatory diagrams showing the state in which bubbles propagate through the half-disk propagation pattern group, FIG. 2 is an explanatory diagram showing the state of bubble rotation in an idler, and FIGS. 3 1 to 6 are diagrams showing the basic form of the present invention. FIG. 4 is a schematic plan view showing an embodiment of the present invention used in a memory. In the drawing, 4 is an idler, 5 is a drive magnetic field, and 5 is a magnetic field generator.

Claims (1)

[Claims] 1. Normally, a plurality of single magnetic patterns that operate as idlers depending on the rotational driving magnetic field are arranged adjacently, and the direction of the driving magnetic field acting on the magnetic patterns is abruptly changed by 180°.
A magnetic bubble device characterized by being provided with a magnetic field generating device that changes and propagates magnetic bubbles between magnetic patterns. 2. The magnetic bubble device according to claim 1, characterized in that a plurality of magnetic patterns are arranged in a matrix shape vertically and horizontally. 3. The number of vertical (or horizontal) magnetic patterns is equal to the number of bits in one word, and after writing magnetic bubbles according to the binary information of each bit of the word, the direction of the driving magnetic field is suddenly changed by 180°. 3. The magnetic bubble device according to claim 2, wherein the magnetic bubble is propagated word by word to the storage magnetic pattern in horizontal rows (or vertical rows).