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Coil Design for Bubble Memory Package

IP.com Disclosure Number: IPCOM000087497D
Original Publication Date: 1977-Feb-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Braun, RJ: AUTHOR [+2]

Abstract

A coil design for a bubble memory package includes a flat wound coil (Fig. 1) wherein the base material is a ferrite core 11 upon which first and second coil layers 13 and 15, respectively, are wound without covering the ends of the ferrite core 11 in a manner such that as current passes through the coils 13 and 15 the ends of the ferrite core 11 act as poles to provide a rotational field component.

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Coil Design for Bubble Memory Package

A coil design for a bubble memory package includes a flat wound coil (Fig. 1) wherein the base material is a ferrite core 11 upon which first and second coil layers 13 and 15, respectively, are wound without covering the ends of the ferrite core 11 in a manner such that as current passes through the coils 13 and 15 the ends of the ferrite core 11 act as poles to provide a rotational field component.

As shown in Fig. 2, a final bubble memory package includes a top wound coil 17 (X-direction) and a bottom wound coil 19 (Y-direction) with the bubble memory devices 21 suitably mounted on carriers 23 so that the bubble memory devices 21 are located between the upper and lower coil windings 17 and 19, respectively. As can be seen in Fig. 2, the magnetic flux lines 25 from the upper coil package pass uniformly between the bubble memory devices 21 mounted on the carriers 23. Similarly, the magnetic flux lines from the coil 19 will pass between the bubble memory devices 21 but in a direction perpendicular to the flux line 25 from the upper coil 17. Therefore, by suitably varying the currents through the upper and lower coil assemblies 17 and 19, a rotational magnetic field effect can be accomplished.

An alternate configuration is shown in Fig. 3 which utilizes a single ferrite core 31 using round, rather than flat, wires, with the first layer 33 (e.g., X windings) wound in one direction around the ferrite core 31 and the second windin...