GB1302767A - - Google Patents

Abstract

1302767 Magnetic storage devices KOKUSAI DENSHIN DENWA KK 20 Feb 1970 [24 Feb 1969] 8183/70 Heading H3B In a magnetic storage matrix, a set of parallel row conductors 2 coated with magnetic material are sandwiched between two sets of column conductors 5, at least one of the latter sets comprising ribbons 6 of conductive material each coated with a thin film of magnetic material 7 except at regions 4 facing adjacent row conductors. The column conductors of a set are held together by insulating material 8, and high packing density may be achieved since the films 7 isolate the column conductors from one another. The structure of Fig. 1 is made by inserting coated ribbons into a grooved carrier 8 and grinding away edges 4, a layer 9 being provided to insulate the rows from each column. Fig. 2 shows an alternative structure where the edges 4 have been etched away to leave an air gap 7a, and a different carrier formed of several spacers 8c is used. In a similar structure, Fig. 7 (not shown), the assembly is mounted on a printed circuit board, the edges of the assembly being cut at an angle to expose to conductors for connection to drive circuitry. An embodiment where only one set of column conductors is coated with magnetic material is also described, Figs. 3-5 (not shown). The coated row conductors may be made by vapour depositing a magnetic strip on to a carrier, vapour depositing a conductor on to the strip, and electrolytically depositing a magnetic film to form, with the strip, a closed film around the conductor. In the above embodiments the easy axis of magnetization of the row conductors is circumferential while in the column conductors it is axial.