GB1094526A - Magnetic memory device - Google Patents

Abstract

1,094,526. Magnetic data-storage devices. TOKO KABUSHIKI KAISHA. March 23, 1965 [March 26, 1964; April 13, 1964]. No. 12267/65. Heading H3B. In a magnetic memory matrix, non-destructive read-out of the binary information stored in magnetized regions p at the intersections of magnetically coated digit lines 1 and word drive lines 4 is accomplished by using read-out drive pulses of insufficient ampere turns to permanently switch the direction of magnetization in the regions. As shown, each digit line 1 has a conductor core 2 coated with a magnetic film 3 having a circumferential easy axis y. Writing in is done by simultaneous application of a write pulse or high frequency current I w and a digit pulse I D of polarity dependent on whether a " 1 " or a " 0 " is to be written in, Fig. 2 (not shown). A read-out pulse on line 5 generates a voltage on the digit line of polarity dependent on the information stored. To reduce the number of terminals needed, part of a word drive line is used as a readout drive line, Fig. 6 (not shown), and preferably diodes are used to short circuit some of the drive line turns with respect to a read-out pulse I R but not with respect to a write pulse I w , Fig. 12 or Figs. 14 and 15 (not shown). The matrix may be woven, Figs 3 to 6 (not shown) or the drive lines (4) and (5) may be printed on insulators (7), Figs. 7 to 11 (not shown).