JPS636951B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a magnetic bubble memory module,
In particular, the present invention relates to a structure of a magnetic circuit suitable for small size and easy to draw out wiring.

[Prior art]

A magnetic bubble memory module requires a bias magnetic circuit and a rotational drive magnetic circuit to retain and transfer magnetic bubbles. FIG. 1 shows the structure of the most common module. The rotation drive magnetic circuit uses rectangular solenoid coils that are orthogonal to each other. In this case, the input/output arrangement from the magnetic bubble chip placed inside the coil must be taken out from between the orthogonal coils, so the coil is made large and provided with an outlet. As a result, the coil becomes larger, resulting in increased drive voltage and power consumption.

FIG.
A magnetic bubble memory module based on Publication No. 47441 is shown. In this rotary drive magnetic circuit, a rotating magnetic field is created in the space inside the core by winding two sets of X and Y windings around a closed core and passing sinusoidal currents perpendicular to each other. In this case, the entire circumference of the core is covered with a conductive shield case in order to prevent unnecessary magnetic fields from escaping and further improve the uniformity of the magnetic field distribution. As with the example in Figure 1, in this circuit as well, it is necessary to take out the input/output lines from the chip placed in the center of the internal space of the core, but if you take them out with the chip mounted on the board, it will hit the core. , it is necessary to use a modified version. Also, winding around a closed core is difficult.

[Purpose of the invention]

The purpose of the present invention is to make input/output wiring easy to take out.
Another object of the present invention is to provide a magnetic bubble memory module having a rotation drive magnetic circuit that is easy to wind.

[Summary of the invention]

In order to achieve the above object, the present invention constructs a rotational drive magnetic circuit by winding four rectangular parallelepiped cores made of soft magnetic material and then combining them in a generally square shape. In this combination, at least one
By creating a level difference between one core and the surface formed by the other core, input/output wire wiring from the magnetic bubble chip placed inside can be taken out extremely easily.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. The figure is a side sectional view, and 11 is a magnetic bubble chip, and 12 is a wiring board on which the magnetic bubble chip is mounted and for guiding input/output wiring from the chip to peripheral circuits. The chip 11 requires a driving magnetic field that rotates within its plane, but in the module of the present invention, the cores 31, 32, 3 arranged around the substrate
3, 34 and a winding 40 placed thereon. To explain in detail in Figure 4, 4
Rectangular parallelepiped core 31, 3 made of soft magnetic material
A winding 40 is applied to each of wires 2, 33, and 34 along the longitudinal direction, and then they are combined to form a square shape as shown in the figure. At this time, the loss of magnetomotive force is reduced by bringing the unwinding parts into contact. With this structure, by passing a cosine wave current through the windings 31 and 32 and a cosine wave current through the windings 33 and 34, a rotating magnetic field can be generated in the space surrounded by the core. Incidentally, the polarity of the magnetic field due to the current is in the same direction in the opposing cores 31 and 32, 33 and 34, as shown by the arrows in the figure. In addition, 50 in Fig. 3 is a shield case made of a highly conductive material such as copper or aluminum, which suppresses the leakage of magnetic fields to unnecessary places, reduces the VI product of the drive circuit, and reduces the magnetic field around the chip 11. This ensures uniformity of distribution. In this way, Figure 3,
In the embodiment shown in Fig. 4, since the coil is wound around a rectangular parallelepiped coil and then assembled, it is easier than winding around a toroidal core, and because the structure has steps, the magnetic resistance between the cores is reduced. It can be made smaller than the one with the tips butted together. Furthermore, this core connection step allows the input/output wiring board from the chip to be easily taken out of the magnetic circuit. In addition, as other embodiments of the present invention, core arrangements as shown in FIGS. 5 and 6 are also possible, and have the same features as described above.

〔Effect of the invention〕

As explained above, according to the present invention, winding and assembly are easier than with a toroidal core, and the magnetic resistance of the core connection portion can be made smaller than with a core in which the tips of the cores are simply butted together. Furthermore, since there is a step in the combined core, wiring can be easily taken out from the chip.

[Brief explanation of the drawing]

1 and 2 are respectively perspective views of a conventional magnetic bubble memory module, FIG. 3 is a side sectional view of an embodiment of the present invention, and FIG. 4 is a perspective view of only the rotation drive magnetic circuit section. 5 and 6 are perspective views of only the rotary drive magnetic circuit section of another embodiment. DESCRIPTION OF SYMBOLS 1... Magnet, 2... Magnetic shunt plate, 3, 4... Square solenoid coil, 5... Shield case made of high magnetic permeability material, 11... Magnetic bubble chip, 12...
...Wiring board, 30-34...Soft magnetic material core, 4
0... Winding wire.

Claims (1)

[Claims] 1. Four rectangular parallelepiped cores made of a soft magnetic material are wound with wires, and the four cores are arranged so that they are in contact with each other at the core portions where no wires are wound so as to form a substantially square shape. The combination is such that at least one core has a level difference from the surface formed by the other core, and the wiring of the input/output line from the magnetic bubble chip placed in the space formed by the core is made. 1. A magnetic bubble memory module that is configured to be easily taken out and characterized in that the core portion is covered almost all around the circumference with a conductive shield case. 2. A step is provided so that the surface formed by two parallel cores among the four cores is on the same surface as the other two cores perpendicular to this core. A magnetic bubble memory module according to claim 1. 3. A step is provided so that the other two cores perpendicular to the four cores are on a different side from the plane where two parallel cores are formed. A magnetic bubble memory module according to claim 1. 4 A step is provided so that only one core of the other two cores orthogonal to the two parallel cores among the four cores is on a different surface from the surface formed by the other cores. Claim 1 characterized in that
Magnetic bubble memory module as described in Section.