JPS62283486A - Magnetic bubble memory device - Google Patents

Abstract

PURPOSE:To improve a bubble transfer characteristic by attaching a bubble memory chip and a rotating magnetic field generating coil by relatively shifting the angle of a rotating direction. CONSTITUTION:The setting is carried out in such a manner that the phase difference phi3 between the chips 1a, 1b and the rotating magnetic field generating X coil 3a, Y coil 3b substantially goes to zero and the peak values of the rotating magnetic field are substantially situated at the positions of 0 deg., 90 deg., 180 deg., 270 deg.. Thereby, the rotating magnetic field strength becomes larger at 0 deg., 180 deg. according to the gap transfer of a basic transfer path in a minor loop limiting the ceiling value side of the transfer bias magnetic field margin of the chip, the driving force during the gap transfer is increased, and the rotating magnetic field strength becomes larger at 90 deg., 270 deg., too and the transfer force at the time of a start is improved in a start/stop operation.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a magnetic bubble memory device suitable for providing an optimum rotating magnetic field to a magnetic bubble memory chip.

[Conventional technology]

Generally, in a magnetic bubble memory device, in order to transfer magnetic bubbles between transfer patterns, it is necessary to apply a rotating magnetic field in the in-plane direction within the plane of the magnetic thin film where the magnetic bubbles exist.

FIG. 5 is a plan view of essential parts of an example of a commonly used magnetic puzzle memory device. In the figure, an X coil 3 and a Y coil 3b for generating a rotating magnetic field are provided on the outer peripheral surface of a substrate 2 in which a magnetic bubble memory chip 1 is housed.
are arranged perpendicular to each other. And X coil 3
A triangular wave current IX for generating a rotating magnetic field as shown in FIG. 6 is passed through the Y coil 3b, and the phase φ! By flowing a triangular wave current Y with a delay of 90°, a rectangular magnetic field is created within the plane of the magnetic bubble memory chip 1, which is a combination of the rotating magnetic fields formed by the currents Ix and Iy, as shown in FIG. It has a trajectory.

A rotating magnetic field that rotates counterclockwise is applied.

According to this method of generating a rotating magnetic field, the intensity of the combined rotating magnetic field is such that the phase φ2 is O' as is clear from FIG.
, 90', 180°, and 270°.

Incidentally, a conventional E-shaped wiring board as shown in FIG. 5 is known from, for example, Japanese Patent Laid-Open No. 78130/1983.

[Problem that the invention seeks to solve]

However, in the magnetic pulse memory device configured in this way, the above-mentioned X coil 3a for generating a rotating magnetic field is
And the rotating magnetic field drive circuit that drives the Y coil 3b is
Due to the circuit constants, the maximum phase values are O', 90'', and 180°, as shown in Figure 8.

There was a problem in that the rotation was delayed by φ3 from 270°, an ideal rotating magnetic field could not be obtained, and the magnetic bubble transfer characteristics deteriorated.

An object of the present invention is to provide a magnetic bubble memory device that can obtain good magnetic bubble transfer characteristics.

[Means for solving problems]

According to one embodiment of the present invention, the relative positions of the X coil, Y coil and the magnetic bubble memory chip are shifted by the amount that the current phases of the X coil and Y coil are delayed, so that substantially One rotation magnetic field no peak force 00.9
0'', 180u, 270°Kfa is provided.

[Effect]

In the present invention, the relative positions of the X coil, the Y coil, and the magnetic bubble memory chip are matched, and the rotating magnetic field applied to the magnetic bubble memory chip is 0°, 90°,
It is substantially maximum at the 180° and 270' positions.

〔Example〕

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

FIG. 1 is a cutaway perspective view of essential parts showing an embodiment of a magnetic bubble memory device according to the present invention, and the same parts as those in the previous figures are given the same reference numerals. In the figure, la and ib are two parallel magnetic bubble memory chips (hereinafter referred to as chips) that write, read, and store information in the form of magnetic puzzles, and 2 are two chips ia and 1b arranged in a predetermined manner. Mounting part 2aK is bonded and fixedly arranged 1) Print wiring board (hereinafter referred to as board), 3a and 3b are steps 1a and lb
An X coil, a Y coil, and a Y coil 4 are wound around the outer periphery of the X-coil 3 and Y-axis to apply a rotating magnetic field for driving magnetic bubbles to the chips 1a and ib so as to be orthogonal to each other in the X-axis and Y-axis directions, respectively. A permanent magnet plate (hereinafter referred to as a permanent magnet plate) for generating bias magnetism that is disposed on the outer surface of the Y coil 3b assembly and applies a bias magnetic field to the chips 1a and 1b; 5 is the outer surface of the Y coil 3b of the permanent magnet plate 4; The chip 1a is placed in contact with the chip 1a.
, 1b is a magnetization plate that uniformizes the bias magnetic field applied to the chips 1a, 1b, and 6 is disposed on the peripheral edge of the back side of the substrate 2 on which the chips 1a and 1b are mounted to clear the magnetic bubbles of the chips 1a and 1b.
This is a loop-shaped bias magnetic field generating coil (hereinafter referred to as bias coil) that generates a testing magnetic field, and although not shown on the back side of this bias coil 6,
A pair of permanent magnet plates and a magnetic shunt plate having the same configuration as the permanent magnet plate 4 and magnetic shunt plate 5 described above are arranged.

Reference numeral 7 designates input/output signal leads (hereinafter referred to as leads) disposed at the first terminal portion 2b and the second terminal portion 2c of the substrate 2.

Reference numeral 8 indicates a shield case (hereinafter referred to as a case) that shields an external magnetic field, and reference numeral 9 indicates a pair of permanent magnet plates 4.
This is a molded resin for fixing the substrate 2 on which the chips 1a and ib are mounted in the case 8 at a predetermined inclination angle with respect to the magnetic field shunt plate 5.

FIG. 2 is a plan view showing the board assembly t-, in which the X coil 3a and the Y coil 3b are wound around the board 2 on which the chips ia and ibt described in FIG. 1 are mounted, respectively. In the figure, two chips ia and ib are fixedly arranged with respect to the substrate 2 while maintaining parallelism with each other, and only the X coil 3a and the Y coil 3b have the delayed phase φ3 difference shown in FIG. It is only rotated, tilted and fixedly placed.

According to such a configuration, the phase difference φ3 between the chips it and ib and the X coil 3a and Y coil 3b becomes almost zero, and the peak values of the rotating magnetic field become substantially 0° and 9°, as shown in FIG.
Set at 0°, 180°, and 2700 positions. This limits the upper limit of the transfer bias magnetic field margin of the magnetic bubble memory chip.The rotating magnetic field strength changes from 0° to 180° in the gap transfer of the basic transfer path in the minor loop.
Since the driving force during gap transfer increases and the strength of the rotating magnetic field also increases at 90' and 270 degrees, it is possible to improve the transfer force at the time of start/stop operation.

FIG. 3 is a plan view of a substrate assembly for explaining another embodiment of the magnetic puzzle memory device according to the present invention, and the same parts as in the previous figures are given the same reference numerals. In the same figure,
The difference from Fig. 2 is that the X coil 3a and Y coil 3b are fixedly arranged with respect to the substrate 2 while maintaining parallelism with each other, and only the two chips 1m and 1b are rotated by the difference in phase φ with a delay in the two chips 1m and 1b. It is tilted and fixedly arranged.

Even in this configuration, the phase difference φ3 between the chips la and lb and the X coil 3a and Y coil 3b is almost zero,
Exactly the same effect can be obtained by the same action as described above.

Note that in the embodiment described above, the chip 1a.

1b, the X coil 3a, and the Y coil 3b are rotated and tilted by the delayed phase φ3, but the present invention is not limited to this.
As shown in FIG. 4, the outer shape of the substrate 2 is tilted by a delay phase difference of φ3 to form a chip 1a.

Place 1b in its normal position without tilting it.

The X coils 3a and 3b have a phase of φ3 corresponding to the inclination of the substrate 2.
The same effect as described above can be obtained even with a configuration in which only the difference is inclined.

〔Effect of the invention〕

As explained above, according to the present invention, by attaching the magnetic bubble memory chip and the rotating magnetic field generating coil with their relative positions shifted, it is possible to correct the shift in the phase difference of the rotating magnetic field.

A magnetic bubble memory device with extremely good magnetic bubble transfer characteristics can be obtained by simple adjustment without changing the constants of peripheral circuits.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway trunk view showing an embodiment of the magnetic bubble memory device according to the present invention, FIG. 2 is a 100-sided view showing the board assembly of FIG. 1, and FIGS. FIGS. 5 to 8 are plan views of a substrate assembly showing other embodiments of the present invention, and are diagrams for explaining the configuration, functions, and operations of a conventional magnetic puzzle memory device. 1, ia, 1b...Magnetic bubble memory chip (chip), 2...Printed wiring board (substrate). 2&...Mounting part, 2b, 2c...Terminal part,
3a φ/1X coil, 3b---Y coil. ,7′

Claims (1)

[Claims] 1. A magnetic bubble memory device characterized in that a magnetic bubble memory chip and a rotating magnetic field generating coil disposed on the outer surface of the magnetic bubble memory chip are attached with relative rotational angles shifted.