| 摘要 |
806,964. Transformers. WESTERN ELECTRIC CO. Inc. Dec. 7, 1956 [Dec. 22, 1955], No. 37478/56. Class 38 (2). [Also in Group XXXIX] A magnetic storage element comprises a bead of ferrite material integrally connected with a conductor. In the manufacture of a magnetic storage array row conductors 1-4, column conductors 13-16 and a readout conductor 21 are spatially arranged and insulated from each other at the cross points by insulating material 25 such as ZrO 2 , SiO 2 or Al 2 O 3 . A drop of ferrite mixture 26 is placed on each cross point to enclose the insulating material and the array is fired at 1250-1450‹ C. to produce ferrite beads. The ferrite mixture may comprise oxides of Mn, Fe, Mg, Ni, Zn, Cu and A1 and is preferably 13.1 per cent MgO, 17.8 per cent MnO and 69.1 per cent Fe 2 O 3 by weight. These oxides are mixed and ground and may or may not be preheated to 850-900‹ C. and reground. They are then blended with a binder (polyvinyl acetate) and a solvent (amyl acetate with alcohol) to produce a liquid slurry which is applied to the cross wires. The insulating material may be dispensed with, the ferrite itself acting as insulation. Row and column conductors in the array are connected to driving networks 27, 28 which may utilize electronic tube, semi-conductor or magnetic elements. |
