JPH0616352B2 - Magnetic bubble transfer circuit - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic bubble transfer circuit, and more particularly to an inverse 180 ° turn transfer circuit in which transfer elements constituting the transfer circuit are made of a soft magnetic material.

[Background of the Invention]

FIG. 1 shows an example of an inverse 180 ° turn transfer circuit which is generally and conventionally used. In the figure, 1 is reverse 18
0 ° corner pattern, 2 is a connection pattern for transferring the magnetic bubbles transferred from the transfer path 2 ′ to the reverse 180 ° corner pattern 1, and 3 is a connection pattern for transferring the magnetic bubbles from the reverse 180 ° corner pattern 1 to the transfer path 3 ′. are transferred in the order of the magnetic bubble together a connexion transfer path 2 in the counterclockwise rotation of the plane rotating magnetic field H _R '→ connection pattern 2 → reverse 180 ° Konapatan 1 → connection pattern 3 → transfer line 3' It will be.

The reverse 180 ° turn transfer circuit having such a configuration is
As shown in the figure, it is used as a corner portion transfer circuit of folded minor loops 6a, 6b, 6c, ... For storing and holding magnetic bubble information. In addition, in FIG.
Reference numerals 7a, 7b, 7c ... Represent a transfer gate portion for inputting / outputting a magnetic bubble, and reference numerals 8a, 8b, 8c. The magnetic bubble memory device having the folded minor loops 6a, 6b, 6c has gate portions 7a, 7b, 7c ...
.., 8a, 8b, 8c ... Can be reduced in cell size of the minor loop transfer pattern while providing a spatial allowance, so that a large-capacity element such as 1 MB or 4 Mb can be downsized. There is.

However, in the conventional reverse 180 ° turn transfer circuit described above, when the starting stop direction of the rotating magnetic field H _R is set to the direction 5 shown in FIG.
There has been a problem that the upper limit of the bias magnetic field in the stop operation decreases as the bias magnetic field is decreased, and the bias magnetic field margin decreases. Also, when the bias magnetic field margin of the start / stop operation at each bit position of the reverse 180 ° turn transfer circuit was examined, a repulsive magnetic pole was generated in a part 1a of the reverse 180 ° corner pattern 1 as shown in FIG.
As a result, the magnetic bubble B that stops on the connection pattern 3
Becomes unstable, and the margin of the magnetic bubble B that stops on the connection pattern 3 is reduced.

[Object of the Invention]

Therefore, the present invention has been made in order to improve the above-mentioned conventional problems, and an object thereof is to provide an inverted 180 ° pattern transfer having excellent characteristics with no upper limit margin loss in the start-stop operation. To provide a circuit.

[Outline of Invention]

In order to achieve such an object, the magnetic bubble transfer circuit according to the present invention is a reverse 180 ° turn magnetic bubble transfer circuit, in which a bar shape is provided between the reverse 180 ° turn transfer element and a transfer element connected to the reverse 180 ° turn transfer element. The pattern is arranged.

Example of Invention

 Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 5 is an inverse 180 ° turn transfer circuit corresponding to FIG. 1 showing an example of the magnetic bubble transfer circuit according to the present invention.
The same parts as those in the figure are denoted by the same reference numerals. 1 is different from FIG. 1 in that a bar-shaped pattern 4 is arranged between the reverse 180 ° corner pattern 1 and the connection patterns 2 and 3 at a predetermined distance.

According to such a configuration, the distance 1 between the reverse 180 ° corner pattern 1 and the connection pattern 3 becomes large, so that the influence of the repulsive magnetic pole generated in a part 1a of the reverse 180 ° corner pattern 1 becomes small. As a result, as shown in the bias magnetic field characteristics of this transfer circuit in FIG. 6, even if the bias magnetic field is reduced, margin loss at the upper limit of the bias magnetic field does not occur.

〔The invention's effect〕

As described above, according to the present invention, since there is no margin loss in the start / stop operation of the reverse 180 ° turn transfer circuit, there is an extremely excellent effect that the reliability in the memory operation can be greatly improved.

[Brief description of drawings]

FIG. 1 is a plan view showing a conventional reverse 180 ° turn transfer circuit,
FIG. 2 is a schematic diagram showing a folded minor loop, FIG. 3 is a diagram showing a bias magnetic field characteristic of a start / stop operation of a conventional reverse 180 ° turn transfer circuit, and FIG. 4 is a magnetic field in the conventional reverse 180 ° turn transfer circuit. FIG. 5 is a plan view showing the stop position of a bubble, FIG. 5 is a reverse 180 ° turn transfer circuit showing an example of a magnetic bubble transfer circuit according to the present invention, and FIG. 6 is a start / stop operation bias of the reverse 180 ° turn transfer circuit according to the present invention. It is a figure which shows a magnetic field characteristic. 1 …… Inverse 180 ° corner pattern, 2 …… Connection pattern, 2 ′
...... Transfer path, 3 ... Connection pattern, 3 '... Transfer path, 4 ...
… A bar pattern.

Claims (1)

[Claims] 1. A magnetic bubble transfer circuit having folding-type minor loops (6a to 6c) formed by a plurality of transfer patterns each having a corner portion whose transfer direction is the same as the direction of the rotating magnetic field and a corner portion opposite to the direction of the rotating magnetic field. Then, a first pattern (2) for transferring the magnetic bubbles in the first direction in the reverse corner portion and a second pattern (3) for transferring the magnetic bubbles in the second direction opposite to the first direction. ), A third pattern (1) for transferring after being converted by 180 degrees across the first and second patterns, between the first and third patterns, and between the second and third patterns. And a supplemental pattern (4) formed along the third pattern, the magnetic bubble transfer circuit.