Browse Prior Art Database

Bubble Domain Page Composer

IP.com Disclosure Number: IPCOM000087836D
Original Publication Date: 1977-Mar-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 3 page(s) / 68K

Publishing Venue

IBM

Related People

Argyle, BE: AUTHOR [+2]

Abstract

A bubble domain magneto-optical page composer using a single magnetic bubble film has been described by Hansen et al in a paper "Bubbles As Latrix Elements", published in the AIP Conference Proceedings, Magnetism and Magnetic Materials, No. 29 (1975), p. 626. It is proposed to modify that page composer to provide a higher density apparatus using less overlay configurations. Additionally, the proposed changes provide more efficient coupling of the magnetic fields to the bubble domains.

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Bubble Domain Page Composer

A bubble domain magneto-optical page composer using a single magnetic bubble film has been described by Hansen et al in a paper "Bubbles As Latrix Elements", published in the AIP Conference Proceedings, Magnetism and Magnetic Materials, No. 29 (1975), p. 626. It is proposed to modify that page composer to provide a higher density apparatus using less overlay configurations. Additionally, the proposed changes provide more efficient coupling of the magnetic fields to the bubble domains.

Fig. 1A is a top view of the proposed page composer, while Fig. 1B is a side view. The composer is comprised of a composite 10 of two magnetic bubble domain films having an array of current-carrying conductors 12 located thereover. The horizontal conductors are the word lines while the vertical conductors are the bit lines in a coincident current selection scheme. Bit positions are the cells defined by the intersections of the conductors 12.

Information is represented by using black (uncoupled) and white (coupled) bubbles or dual-size bistable bubble domains (U.S. Patent 3,911,411) for representing binary 1's and 0's. Bubble state transitions 1-->0 and 0-->1 are used for writing information. For more detail, reference is made to B. E. Argyle et al, IBM J. of Res. & Devel., Vol. 20, No. 2, March 1976, p. 109.

Two magnetic bubble films are used for this device, as shown in Fig. 1B. A first magnetic film 14 is located on the substrate 16 and contains the black bubbles B . A nonmagnetic spacer 18 is located between bubble film 14 and bubble film 20 which has the "white" capping bubbles B. A first metallization layer 22 is located over bubble film 20, and an insulating layer 24 separates conductive layer 22 from second conductive layer 26.

A lattice of bubble domains is present in one of the bubble films 14 or 20 (in Fig. 1B, the lattice bubbles B(L) are in film 14). An analyzer-polarizer combination is set for the extinction of these bubbles. Half...