JPS62298085A - Magnetic bubble memory driving coil - Google Patents

Abstract

PURPOSE:To obtain an equal magnetic field distribution with a wide area by changing the winding density of a plane coil to form a bending coil by a place. CONSTITUTION:For the A part and B part of bending coils 10 and 10', the winding density is changed. Namely, the coils are wound so that the winding density can be dense at the A part and coarse at the B part. Thus, the magnetic flux density of the A part is raised, the magnetic field distribution shown by a curved line A as a whole is obtained and the scope of the equal magnetic field is expanded compared with the conventional example shown by a curved line B. In this way, the equal magnetic field distribution with a wide area can be obtained.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Summary] This is a magnetic bubble memory drive coil that is made by multiple windings of continuous conductor wire in a flat shape, and by changing the winding density depending on the location, it can be used over a wide area. This makes it possible to obtain a uniform magnetic field area.

[Industrial application field]

The present invention relates to a magnetic bubble drive coil for a magnetic bubble memory device.

The most common method for controlling magnetic bubbles is a control method using a rotating magnetic field and a permalloy pattern. This involves applying a rotating magnetic field from the outside to permalloy patterns such as half-disk shapes formed in rows on bubble crystals.
This creates a magnetic pole in the permalloy pattern, and the movement of the magnetic pole causes the bubbles to be sequentially transferred to the adjacent pattern.

This rotating magnetic field is generated by passing currents, such as sine waves or triangular waves, through an X coil and a Y coil arranged orthogonally to each other, with the phases shifted.

Solenoid coils 1 and 2 as shown in Figure 5 are used for the X and Y coils, but the terminal area A from the chip 3 is small, especially when the density is increased and the number of terminals is large. becomes difficult.

For this reason, methods have been proposed in which a flat coil is used in a flat state or in a bent state.

(Japanese Patent Publication No. 55-20307) [Prior Art] Fig. 6 shows an example in which a flat coil is used in a bent state. It is combined with a solenoid coil (Y coil) 5 wound around the outer periphery of the chip 3.

[Problem that the invention seeks to solve]

This conventional bending coil has the disadvantage that the magnetic field distribution is as shown in FIG. 7, and when trying to obtain a highly uniform magnetic field over the entire surface of the chip, the winding width (curved shape) and inductance become large.

The present invention was created in view of these points, and aims to provide a magnetic bubble memory drive coil using a folded coil that can apply a uniform magnetic field to a chip with a simple configuration and can be miniaturized. The purpose is

[Means for solving problems]

Therefore, in the present invention, in a magnetic bubble memory drive coil that is used in a bent state, the coil is constructed by multiple windings of an 8i conducting wire in a plane shape, and the coil is characterized in that the winding density is changed depending on the location. There is.

[For production]

By changing the winding density of the planar coil forming the bent coil depending on the location, it is possible to obtain a uniform magnetic field distribution over a wide area.

〔Example〕

FIG. 1 is a diagram for explaining the present invention in detail, in which a is a diagram showing a coil cross section and b is a diagram showing a magnetic field distribution.

In this embodiment, the bent coils 10 and 10' are
The winding density is different between the part and the B part. That is, the winding density is densely wound in the A part and coarsely in the B part.

In this embodiment, the means for changing the winding density is to make the outer diameter of the insulated winding 11 thinner in the A section, thicker in the B section, and
The material is wound into a flat plate shape as shown in FIG. 2 using the winding frame 12 shown in FIG. In order to change the thickness of the insulated conductive wire, the thickness of the core wire may be changed, or the thickness of the core wire may be the same but the thickness of the insulation coating may be changed.

In this embodiment configured in this way, the magnetic flux density in the A section increases, and the overall magnetic field distribution becomes as shown by curve A in Figure 1, and the range of the uniform magnetic field is wider than that of the conventional example shown by curve B. Expanded.

FIG. 3 is a diagram for explaining another embodiment of the present invention.

In this example, as in the previous example, the winding density is changed depending on the location.The windings are staggered, and the closer they go to the outside of the coil, the more they overlap, making the winding density thicker. To form this coil, a winding frame 13 as shown in Fig. 4 is used.
This can be done using That is, in the winding frame 13, the width of the winding groove increases toward the inner circumference, so that the windings overlap each other more.

This embodiment formed in this way is as shown in FIG.
Since the winding density is increased on the outside, the magnetic field distribution is similar to that of the previous embodiment, and the uniform magnetic field range is expanded compared to the conventional example.

〔Effect of the invention〕

As described above, according to the present invention, the uniform magnetic field range can be increased with an extremely simple configuration, and is extremely useful in practice.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining the present invention in detail, FIG. 2 is a diagram showing a winding frame and a plane coil for winding a coil according to an embodiment of the present invention, and FIG. 3 is a diagram showing another embodiment of the present invention. Figure 4 is a diagram for explaining an example. Figure 4 is a diagram showing a winding frame for winding a coil according to another embodiment of the present invention. Figure 5 is a diagram showing a magnetic bubble memory drive coil using a conventional solenoid coil. Fig. 6 is a diagram showing a magnetic bubble memory drive coil using a conventional bent coil, and Fig. 7 is a diagram showing a magnetic field distribution in a cross section taken along the line ■-■ in Fig. 6. In Fig. 1, 10 , 10' is a bent coil, and 11 is an insulated conductor.

Claims (1)

[Claims] 1. A magnetic bubble memory drive coil in which a coil formed by multiple windings of insulated conductive wire in a plane is used in a bent state, characterized in that the coil has a winding density that varies depending on the location. Magnetic bubble memory drive coil.