JPS6319956B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic bubble memory chip, and more particularly to an improvement in a transfer circuit pattern for transferring magnetic bubbles.

FIG. 1 is an enlarged plan view of essential parts of an example of a commonly used magnetic bubble memory chip. In the figure, 1 is a minor loop that stores information, 2 is a read mager line that transfers read information,
3 is a lightmager line that transfers write information; 4 is a bubble detector that converts magnetic bubbles into electrical signals; 5 is a magnetic bubble generator that writes information onto the lightmager line 3; 6 is a minor loop 1
A replicate gate 7 copies the above information onto the read mager line 2, a swap gate 7 swaps the information on the light mager line 3 with information in the minor loop 1, and 8 prevents unnecessary magnetic bubbles from entering from the outer periphery. The guardrail 10 is a bonding pad that connects these transfer circuits to an external circuit.

In order to improve the data transfer rate, the magnetic bubble memory chip constructed in this way usually uses a double length period mager line method as shown in FIG. 2b, in contrast to the conventional method shown in FIG. A line method is used, and by using this double-length period Meijer line method, the data transfer rate can be doubled. In these figures, 11a and 11b are chevron patterns that form the transfer circuit of the read mager line 2 and the write mager line 3, and in the case of the conventional method shown in FIG. The period λ of the transfer circuit pattern 11a is approximately the same size (λλ ₁ ) as the period λ ₁ of the transfer circuit pattern element forming the minor loop 1. On the other hand, in the case of the double length period method shown in FIG _. 2 times (Λ〜2λ ₁ )
becomes. The present invention relates to the above-mentioned double length cycle type magnetic bubble memory chip.

FIG. 3 shows an example of a transfer circuit pattern of a read mager line 2 having a period Λ, a light mager line 3 and a minor loop ₁ having a period λ 1. In the same figure, when the diameter of the magnetic bubble to be transferred is d, normally λ ₁ is (3 to 4) d,
Λ is selected to be approximately 2λ ₁ .

However, in the magnetic bubble memory chip of the double length period method with the above configuration, all pattern elements of the mager line, which is the read mager line 2 or the write mager line 3, as shown in FIG. 1, are formed by the double length period method. if you did this,
A problem occurred in that the transfer characteristics of the magnetic bubble deteriorated and the bias magnetic field margin ΔH _B was halved.

Therefore, the present invention provides a magnetic structure that prevents deterioration of transfer characteristics and improves data transfer rate by forming mager lines with a mixture of double-length periodic patterns and single-length periodic patterns. The purpose is to provide bubble memory chips.

The present invention will be explained in detail below.

As a result of investigating the cause of the deterioration of transfer characteristics in the conventional double-length cycle type mager line, the following was clarified through experiments. That is, in the read mager line 2 or the light mager line 3 illustrated in FIG. 1, the portion where the transfer characteristics deteriorate is the 90° corner portion 12 surrounded by a circle, and the other straight portions do not have characteristics deterioration. Nakatsuta. FIG. 4 shows the arrangement of the chevron pattern 11b in this 90° corner portion 12.

Therefore, the idea of the present invention is that the linear transfer portion of the Meijer line has a double length period, the corner portion has a Meijer line with a single length period, and the pattern elements have a mixture of double length periods and single length periods. It was formed by

However, if the double length period and the _single length period are simply mixed, as shown in _FIG . From 1x long period Λ ₂ pattern 11a to 2x long period Λ ₁ pattern 1
A connecting part l is formed which passes to 1b. This connection portion l is, for example, Λ ₁ =16 μm pattern 11
If the pattern 11a with Λ ₂ =8 μm was immediately changed from pattern b to pattern 11a, there was a risk that a margin loss in the transfer characteristics would occur at this connection portion l.

Therefore, in the present invention, as shown in the simplified pattern arrangement diagrams in FIGS. 6a and 6b, the pattern 11a with the single length period Λ ₂ =8 μm shown in FIG. 6a and the double length period Λ ₁ =
As shown in Figure b, for the connecting portion l=0 between the 16 μm patterns 11b, the pattern 11a has a single length period Λ ₂ =8 μm and the pattern 1 has a double length period Λ ₁ =16 μm.
A plurality of intermediate periodic patterns with gradually different periods Λ, that is, periods Λ=9,
7 intermediate periodic patterns 11c, 11d, 11e, 11f having sizes of 10, 11, 12, 13, 14, 15 μm,
11g, 11h, and 11i are interposed to form a mager line.

According to such a configuration, the magnetic bubbles are smoothly transferred at the connection portion l between the single length period Λ ₂ pattern 11a and the double length period Λ ₁ pattern 11b, and therefore, this connection portion We were able to completely solve the problem of margin loss in l.

7 and 8 are diagrams for explaining other embodiments of the magnetic bubble memory chip according to the present invention, in which FIG. 7 shows means for forming pattern elements interposed in the connecting portion l; The figure shows a simplified arrangement of pattern elements formed by this means. First, as shown in FIG. 7, the pattern elements to be interposed in the connection portion l are, for example, the right half pattern 13a shown by the solid line part of the period Λa = 16 μm pattern 13 shown in FIG. A pattern 15 with a period Λc = 15.5 μm as shown in FIG. In the same way, a plurality of connection patterns with different periods are formed, and these pattern elements are formed into a pattern with a period of 1 times longer period Λ ₂ pattern 1 as shown in FIG.
1a and the double length period Λ ₁ pattern 11b, four intermediate period patterns 11j, 11k, 11 with periods Λ=9.5, 11.5, 13.5, 15.5 μm are placed in the order of 11b.
1 and 11m, respectively, to form a magia line.

According to such a configuration, the length of the connecting portion l is approximately half that of that shown in FIG. 6, and the required space can be reduced and the same effects as described above can be obtained.

In addition, although the case where a chevron pattern was used as a pattern element was explained in the example, the present invention is not limited to this, and patterns having other shapes such as a half-disk pattern may also be used. Of course, the same effects as described above can be obtained.

As explained above, according to the present invention, the extremely excellent effect of being able to improve the data transfer rate without deteriorating the transfer characteristics of magnetic bubbles was obtained.

[Brief explanation of the drawing]

Fig. 1 is an enlarged plan view of the main part showing an example of a magnetic bubble memory chip, Figs. FIG. 4 is an enlarged plan view of the main part showing an example of the transfer circuit pattern, FIG. 4 is an enlarged plan view of the main part showing an example of the 90° corner circuit pattern, and FIGS.
The figure is a diagram for explaining an embodiment of a magnetic bubble memory chip according to the present invention. 1...minor loop, 2...lead magger line, 3...light magia line, 11a...
1x long periodic pattern, 11b...2x long periodic pattern, 11c to 11m... intermediate periodic pattern.

Claims (1)

[Claims] 1. A magnetic bubble memory chip equipped with a plurality of minor loops for storing and transferring magnetic bubbles and a mager line for reading or writing magnetic bubbles between the minor loops,
The mager line has a double length periodic pattern in its straight portion and a single length periodic pattern in its corner portion, and an intermediate period whose period gradually changes is formed at the connecting portion between the double length periodic pattern and the single length periodic pattern. A magnetic bubble memory chip characterized by intervening periodic patterns.