JPS6243890A - Magnetic bubble device - Google Patents

Abstract

PURPOSE:To increase the data transfer speed with a few detection circuits by combining at least >=2 sets of thick film detectors having different patterns to form an electric bridge. CONSTITUTION:When a magnetic bubble passes beneath a detection line, the resistance of the detection line is changed by a leakage magnetic field from the magnetic bubble and an output is obtained by taking a difference from the resistance of a detection line (dummy detection line) through which no magnetic bubble passes, and the output waveform depends on the shape of the detection line. Detection lines 7 having different patterns are combined to form a bridge, then sum of outputs of the two detection lines 7 appears and since the phase of main peaks P1a, P1b is different, each peak is detected. Thus, a thick film detector is used, one detector processes plural detectors to increase the data transfer speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic bubble memory, and particularly to a magnetic bubble device suitable for increasing data transfer speed without complicating peripheral circuits.

[Background of the invention]

One of the problems with magnetic bubble memory devices is that the data transfer rate is low. This is the first magnetic bubble (Ohmsha) that generates the rotating magnetic field necessary to drive the magnetic bubble.
This is because, as described on pages 41 to 143, a solenoid coil is used, so the frequency of the rotating magnetic field can only be adjusted to 200 KH1 to 300 KHz at most. Therefore, as shown in FIG. 2, in the magnetic bubble memory device, n detectors (11, 12, 13
...) at the same time to increase the data transfer rate to n.
Increase twice. However, the disadvantage of this method is that it is necessary to prepare as many detection circuits as there are detectors, and the peripheral circuitry becomes complicated.

As a method to reduce the number of detection circuits, the International Society of Magnetics (I)
international conference o
There is a method shown in nMagnetic@). In this method, as shown in FIGS. 3(a) and 3(b), the thin film detection line 5 is made of a soft magnetic material (permalloy, an alloy of Ni-Fe) for enlarging the magnetic bubble. A detector whose position is changed relative to the chevron-type transfer path 4 is used. A bridge is assembled as shown in FIG. 3(C) using detectors with different detection line positions, and one detection circuit (differential amplifier) operates the two detectors. Thereby, the number of detection circuits can be reduced to half of the conventional one. Further, regarding the thin film type detection line, details can be found in Magnetic Engineering Course 4 "Magnetic Bubble" (Maruzen), pages 215 to 217.

One problem with this method is that from page 217 of the same
Compared to the conventional thick film detector described on page 19,
The process becomes complicated.

That is, a thickness of 3000 mm to expand the magnetic bubble.
In addition to the chevron transfer path 4 made of permalloy with a thickness of about 4000, a thin film detection line also made of permalloy with a thickness of about 300 is required.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic bubble device that eliminates the above-mentioned drawbacks and can increase data transfer speed with fewer detection circuits.

[Summary of the invention]

The gist of the present invention is to provide a magnetic bubble device having means for detecting magnetic bubbles on a chip and means for electrically processing signals from the detecting means, in which the nuclear detecting means has a main part and a dummy part. A magnetic bubble, which is a film-type detector and is characterized in that an electrical bridge is formed by combining at least two or more sets of thick-film detectors with different pattern shapes and connected to the electrical processing means. It's in the device.

[Embodiments of the invention]

FIG. 4 shows a thick film detection line that is easy to process.

When a magnetic bubble passes directly under this detection line, the resistance value of the detection line changes due to the leakage magnetic field from the magnetic bubble.
As a result, the resistance value of the detection line changes depending on the position of the magnetic bubble, and by taking the difference from the detection line through which the magnetic bubble does not pass (called a dummy detection line), the output shown in Figure 5 is obtained. . This output waveform changes depending on the shape of the detection line.

For example, in the detection line shown in Figure 4, the detection current flows only in the latter half of the transfer pattern, so the detection output also appears when the main magnetic bubble passes through the latter half of the pattern (Figure 5). 0 However, with a detector that connects the first half of the transfer pattern as shown in Figure 6(a), the detection output mainly appears when the magnetic bubble passes through the first half of the pattern.
The result will be as shown in FIG. 6(b). Comparing FIG. 5 and FIG. 6(b), it can be seen that the phases in which the main peaks appear are different. Therefore, the detection lines in FIG. 4 and FIG. 6(a) are combined to form a bridge as shown in FIG. 1 in the same manner as in FIG. 3(C) of the prior art.

Then, as shown in FIG. 7, the sum of the outputs of the two detectors appears, and since the main peaks have different phases, each peak can be detected. That is, P, , and P
Use the lb peak. In this case, the output (peak value)
If the output is sufficiently large, discrimination can be performed using the same reference value (threshold level), but if the output is small, separate reference values are prepared for each peak, and an overlapping process is performed for each peak. Using a thick film type detector that can be fabricated,
One detection circuit can process multiple detectors and increase the data transfer rate.

By further advancing the above idea, we can create even more detectors per unit.
Can be detected with two detection circuits.

For example, each pattern of detection lines in FIG. 4 may be slightly rotated to look like that in FIG. 8(a). Then, the phase of the detection output is delayed accordingly, as shown in FIG. 8(b). The dotted line in this figure is the output of the detection line in Figure 4, and the output waveform only changes its shape slightly.

There is a phase shift. The same thing can be done for the detection line l connecting the first half of FIG. By assembling these detection lines into a bridge as shown in Figure 9,
Four detection lines can be operated by one detection circuit.

[Brief explanation of the drawing]

Figure 1 is the arrangement of detection lines, Figure 2 is a schematic diagram of the detection system, Figure 3 is the number of thin film detection lines ai, (b) and connection diagram (C), and Figure 4 is the thick film detector. A schematic diagram of , Figure 5 is a diagram of the output waveform,
Fig. 6 is a schematic diagram of a thick film type detection line and a diagram of the output waveform, Fig. 7 is a diagram of the output waveform, and Fig. 8 is a thick film type detection line. *tfi M (7
) T□,, 11 cars? Place, □ Yoko. It is. 11.12, 13.14...Detector, 21, 22゜2
3.24...Detection circuit, 3...Buffer circuit, 4.
...Chevron type transfer path for expansion, 5...Thin film type detection line, 6...Differential amplifier, 7...Thick film type detection line layer ) (Ri No. 40)〉〉〉〉〉〉〉〉〉〉〉〉〉〉

Claims (1)

[Claims] In a magnetic bubble device having means for detecting magnetic bubbles on a chip and means for electrically processing signals from the detecting means, the detecting means is a thick film type detector consisting of a main and a dummy. A magnetic bubble device characterized in that an electrical bridge is constructed by combining at least two or more sets of thick film type detectors having different pattern shapes, and connected to the electrical processing means.