JPS594784B2 - magnetic bubble device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic bubble device, and more particularly to improving the S/N ratio based on noise appearing in the output signal.

The magnetic bubble device includes a magnetic bubble chip made of a magnetic thin film, a lead wire for connection to an external circuit, and an orthogonal driving coil that applies a rotating magnetic field in a horizontal direction to the chip to transfer magnetic bubbles. The main structure includes a magnetic head 5 which applies a bias magnetic field in the perpendicular direction to the chip to effectively create magnetic bubbles.

FIG. 1 is a simplified configuration diagram showing the plane of the conventional magnetic bubble device of the above type, and in the figure, reference numeral 1 denotes a plurality of magnetic bubble chips arranged on a base 2, each connected to a lead wire 3. Ru.

As shown in FIG.
A permanent magnet 6 and a yoke plate T are arranged around which drive coils 4 and 5 are wound, and which provide a bias magnetic field. Both drive coils 4 and 5 are supplied with currents with 15 different phases to supply a rotating magnetic field in the horizontal direction to the bubble chip 1.Actually, a sine wave current is supplied to the X direction drive coil 4, A cosine wave current is supplied to the directional drive coil 5. The permanent magnet 6 supplies a bias magnetic field perpendicular to the magnetic bubble chip 1, and the magnetic circuit of the permanent magnet 6 is formed by a yoke plate T made of a high permeability magnetic material such as permalloy or ferrite. It is formed. In addition,
The above bubble chip 1 has the axes x and y of the coils 4 and 5, respectively.
are arranged along the direction of 95 FIG. 3 is a plan view showing the entire bubble chip 1. In the figure, 31 is a bubble generator, 32 is a transfer path, and 33 is a replicator that divides and copies the bubbles in the transfer path 32.

Reference numeral 34 denotes a bubble detection section, which, as shown in FIG. It consists of a conductor 43,
When the rotating magnetic field H rotates in the direction shown in the order of vectors A → 口 → C → 2 in FIG. are transferred in this order.

Meanwhile, bubble B is detected by the detector 42 during this transfer. Note that in FIG. 3, 35 is a punch ink pad.

Therefore, in such a configuration, after the bubble B is generated by the nucleation magnetic field HN formed by the bubble generator 31,
The signal is transferred on the transfer path 32, duplicated by the duplicator 33, and detected by the detector 34. 6A, b, and c show waveform diagrams of the current flowing through the X-direction drive coil 4, the current flowing through the Y-direction drive coil 5, and the output signal of the detector 34, respectively, and as is clear from FIG. 6C, Noise N appears in the output signal when the polarity of the current flowing through the coils 4 and 5 changes.

Therefore, a method has been adopted in which the output signal and the noise N are distinguished by a strobe pulse. However, according to this method, the noise N appears near the peak value of the bubble detection signal P of the output signal, so it is difficult to detect the noise N. It is necessary to extract the output at a position lower than the peak value of the signal P, and therefore the S/
This has the drawback that N is poor and it is not possible to obtain a large position margin. Therefore, an object of the present invention is to prevent the noise N from appearing near the position of the peak value of the bubble detection signal P, and will be described in detail below using examples. FIG. 7 is a plan view showing an embodiment of the magnetic bubble device according to the present invention, and the same parts as in FIG. 4 are designated by the same reference numerals.

In this case, the bubble detection unit 34 is rotated in 45 directions with respect to the axes X and y of the X and Y direction driving coils 4 and 5.
A bubble chip 1 is formed. Note that the transfer path 32 in this case is not tilted at any angle with respect to the coils 4 and 5. According to such a configuration, the bubble B moves in the order of A → mouth → 8 → 2, etc. with respect to the vector of the rotating magnetic field H having an angle of deviation of 45 as shown in FIG. Then, detector 4
Detected at 2.

At this time, the relationship between the current flowing through the X-direction and Y-direction drive coils 4 and 5 and the output signal is as shown in FIG. 9A, b, and c, and as is clear from the figure, the output signal is , the phase is shifted by 45 with respect to the current. Note that the symbols I to I shown in FIG. 7 correspond to the symbols I to I shown in FIG. 9C, respectively. Therefore, noise no longer appears at the peak value position of the bubble detection signal P in the output signal, and therefore the output at the peak value position can be extracted.
This has the effect of increasing the S/N and phase margins. Note that in this embodiment, the bubble detection unit 34
The positions of the drive coils 4 and 5 in the orthogonal X and Y directions
Although the explanation has been made assuming that the angle is shifted by 45 degrees, the angle may be shifted by more or less than that.

The point is that the noise N should not appear at the pix value position of the bubble detection signal P. Further, the shape of the detector may be a Siepron type or the like.

Further, the waveform of the current flowing through the X-direction and Y-direction drive coils 4 and 5 may be a triangular wave or the like.

[Brief explanation of the drawing]

Figures 1 to 4 are simplified configuration diagrams showing an example of a conventional magnetic bubble device, Figures 5 and 8 are vector diagrams showing rotating magnetic fields, and Figures 6A, b, and c are conventional magnetic bubble devices. FIG. 7 is a simplified configuration diagram showing an embodiment of the magnetic bubble device according to the present invention, and FIG. 9 A, b, and c are diagrams showing the operating characteristics of the magnetic bubble device according to the present invention. . 1...Bubble chip, 2...Substrate, 3
...Lead line, 4,5...X direction, Y
Directional drive coil, 6...Permanent magnet, 7...
... Yoke plate, 31 ... Bubble generator, 32
...Transfer path, 33...Replicator, 34.
...Bubble detection section.

Claims (1)

[Scope of Claims] 1. A bubble chip having at least a loop for transferring and storing information, a bubble generator, a bubble replicator, and a bubble detector for detecting replicated bubbles, and a rotating magnetic field applied to the bubble chip. In a magnetic bubble device comprising at least an orthogonal coil that supplies A magnetic bubble device featuring: 2. The magnetic bubble device according to claim 1, wherein the arrangement direction of the bubble detection section formed on the bubble chip is shifted by 45 degrees within the plane of the bubble chip with respect to the axis of the orthogonal coil.