| 摘要 |
896,263. Magnetic core storage devices. NATIONAL CASH REGISTER CO. Oct. 1, 1959 [Oct. 1, 1958; Nov. 7, 1958; Nov. 14, 1958; April 2, 1959], No. 33301/59. Class 38 (2). [Also in Group XXXVI] A ferromagnetic element for use as a coincident current memory element in computers and data processors comprises a core of copper aluminium, silver, brass, bronze or alloys thereof provided with a ferromagnetic coating comprising an alloy containing iron and nickel the plated core being twisted and maintained in that position during operation so that the easy direction of magnetization of the coating is orientated in a helical direction throughout the core length. Such a coating has a high positive and negative magnetic remanence and a rectangular hysteresis characteristic. It may be allowed to attain one or other of two stable conditions and is thus suitable for the storage of binary information. The electrical characteristics of devices of this nature made from electroplating of varying composition are tabulated. The physical shape of the core may be tubular, toroidal, planar, rod or ribbon-shaped or the cord may be a thin electrically-conductive film mechanically supported by an insulator such as glass, plastic or ceramic. The preferred cord is a hollow phosphor bronze wire-like tubing having an outside diameter of approximately 15 mils. and an inner diameter of approximately 8 mils. As an alternative to the twisted form of construction the cord may have grooves formed therein before the electrodeposit is effected. The grooves may be V-shaped and helically disposed about the periphery of the cord, thus providing an easy direction of magnetization without the necessity for twisting.
|
