JPS5847786B2 - Magnetic bubble drive coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bubble 1 drive coil that generates a rotating magnetic field for transferring magnetic bubble domains, and particularly to its winding structure. It provides a drive coil.

As is well known, in the magnetic bubble device, a plane on which a magnetic bubble chip is mounted is placed in a set of two drive coils arranged orthogonally, and the two drive coils are operated under a bias magnetic field acting perpendicular to the chip. By applying alternating current or pulse currents with a phase shift of 90 degrees, a magnetic field rotating in a plane parallel to the chip is generated to transfer magnetic bubbles.

This single drive coil is generally cylindrical and wound in multiple layers as shown in FIG.

In this first drive coil, only the inner layer is first wound over the entire length in the direction of the winding core, as indicated by the numbers in the winding cross section.

For example, when the inner layer coil finishes winding at the 15th turn, it is simply folded back to the outside of the inner layer coil and wound in the reverse direction for the 16th and 17th turns in the order of C, and only the outer layer is wound continuously until the 29th and final turn. Turn.

Since such a Q-winding structure is simple, automatic winding is easy and manufacturability is high. However, when a high frequency drive current is applied, the distributed capacitance increases and high frequency loss increases.

This is due to the large potential difference between the inner layer and the adjacent windings immediately outside it. Therefore, as shown by the winding numbers in Figure 2, each turn of the inner layer The inner and outer layers are wound alternately every turn, such as folding back and wrapping the outer layer once, then wrapping it back around the inner layer and making one turn. can be minimized.

However, such a winding structure cannot be achieved by mechanical winding (automation is extremely difficult, so winding by hand is the only option).

Therefore, in the present invention, the idea of alternating winding shown in FIG.
Incorporating the continuous winding shown in the figure makes it suitable for automatic winding, and enables a small winding structure with distributed capacitance that can be ignored in practice.

To achieve this purpose, the present invention provides a rotating magnetic field generation bubble 1 drive coil for transferring magnetic bubble domains (herein, a multi-layer wound coil is divided into a plurality of small blocks, and each small block unit is The coil is wound in multiple layers, and the small block coils are successively wound in the direction of the winding core (in close contact with each other). A structure is adopted in which the end of winding of a small block is guided to the beginning of winding of the next small block at a location other than the plane parallel to the bubble chip surface of the cylindrical coil.

Next, examples will be used to explain how the magnetic bubble drive coil according to the present invention is actually implemented.

FIG. 3 is a winding sectional view showing the winding structure of the present invention.

In the illustrated example, after the inner layer is wound five times, the outer layer is continuously wound around the outer layer for several turns, and then returned to the inner layer and continuously wound for several turns.

In this way, by alternately winding the inner layer and the outer layer several turns each, a structure in which the multi-layered small block coils are continuous in the direction of the winding core (automatic winding can be easily achieved by rubbing).

In other words, automatic winding is extremely easy if the inner and outer layers can be wound continuously, even every few turns. There is no risk of the inner layer collapsing even when the watch is used, and automatic winding is possible.

Also, unlike the case where the inner layer and outer layer are wound continuously to the end as shown in Figure 1, the inner layer is returned to the outer layer every few turns, so the distributed capacitance between the inner layer winding and the adjacent outer layer winding is is small, and high frequency loss is significantly improved.

Note that it is best to alternately wind the inner layer and outer layer every few turns; automatic winding becomes extremely difficult if each turn is used as shown in Figure 2, and automatic winding becomes less effective after several turns. Although there is no improvement, the increase in distribution capacity is remarkable.

FIG. 4A is a perspective view of a coil in which the inner and outer layers are wound alternately every few turns as shown in FIG. 3, and the opening in the figure is a front view of the same coil.

The coil in the illustrated example is wound into a rectangular cylindrical shape, and when a bubble chip b mounted on a plane a is installed, the long side c-c' of the coil is parallel to the plane of the chip b. .

That is, a magnetic field is generated that rotates in a plane parallel to chip b along the long side c-c'.

Therefore, it is desirable that the magnetic field generated on the long side c'c' be undisturbed.

For this reason, the present invention provides a winding e' from the end of winding of the outer layer of each small block to the start of winding of the next small block at a location other than the long side c'c', that is, on the short side d (or d).
I am trying to guide C'...

In addition, the drive coil is not necessarily wound in an orderly rectangular shape as shown in the figure, but as shown in Fig. In this case, the winding is guided from the outer layer to the inner layer of the next small block.

When divided into small blocks of multi-layer winding like this, the number of line segments running diagonally like e, 1, etc. between each small block increases, but since this is processed on a plane that is not parallel to the chip surface, The bubble driving magnetic field is not disturbed.

As described above (according to the present invention), a multilayer wound coil is divided into a plurality of small blocks (multilayer winding is applied to each small block, and the small block coils are sequentially connected in close contact with each other in the direction of the winding core). Therefore, it is possible to realize a magnetic bubble driving coil that has excellent magnetic efficiency, can reliably drive one magnetic bubble domain, consumes less power and generates less heat, and has a small external size.

In addition, the coil is formed into a cylindrical shape with a surface parallel to the surface of the built-in bubble chip, and the end of winding of the small block is Since the coil is guided to the beginning of winding of the small block, the part where the coil runs diagonally (therefore, the driving magnetic field of the bubble is not disturbed, and malfunction of the bubble can be reliably prevented.

Note that when constructing a magnetic bubble device using the illustrated drive coils, it goes without saying that two coils may be mounted orthogonally and a bubble chip placed therein.

[Brief explanation of drawings]

Figures 1 and 2 are cross-sectional views of a conventional magnetic bubble drive coil, Figure 3 is a cross-sectional view of a magnetic bubble drive coil according to the present invention, and Figure 4A is a perspective view of the coil in Figure 3. and a front view, and FIG. 5 is a front view of a magnetic bubble drive coil according to another embodiment. In the drawings, a is a plane, b is a magnetic bubble chip,
c-c' is the long side of the coil, d-d' is the short side of the coil, e
``e''... is the diagonal portion of the winding, and f.f' is the arc-shaped portion.

Claims (1)

[Claims] 1. In a bubble drive coil for generating a rotating magnetic field for transferring magnetic bubble domains, a multilayer wound coil is divided into a plurality of small blocks, and each small block is subjected to multilayer winding to form a small block coil. The coils are successively connected in a continuous manner in the direction of the winding core (this creates a multi-layered winding structure, and the coil is shaped like a cylinder with a surface parallel to the surface of the built-in bubble chip, and the surface of the bubble chip of this cylindrical coil and A magnetic bubble driving coil characterized in that the end of winding of a small block is guided to the start of winding of the next small block at a point other than a parallel plane.