Patent GB-898019-A (GB)
Title: Units comprising elements with small openings traversed by electrical conductors
IPC: H05K7/02
Filed: 1957-08-23
Abstract: 898,019. Magnetic information-storage apparatus. EISLER, P. July 21, 1958 [Aug. 23, 1957], No. 26654/57. Class 40 (9). [Also in Group XXXVI] In an information storage matrix comprising apertured magnetic cores positioned between two co-ordinated patterns of electrical conductors, each pattern is printed on a thin flexible insulating support such as plastic film, and the conductors are interconnected through the apertured wires by a plurality of parallel conductors, also on insulating supports, having assembly joints with the conductors of at least one of the patterns. In one arrangement, the two co-ordinated patterns 21, 31, Figs. 2 and 3, have the insulating support portions indicated by dotted lines 22, 32 cut out prior to assembly. The assembled patterns are both mounted with their printed conductors adjacent the cores. In construction, the Fig. 2 pattern is fitted between bars 51, 52 of a jig, Fig. 5, and is folded along the lines 1 to 6 by bringing the bars closer together and using deflector blades 58, 59, those parts of the conductive pattern in the folding zones comprising conductors meeting at a point being raised upwards, while the other parts are folded downwards. An assembly comprising varnish-insulated cores 41 mounted in a spacer grid 42 and held in position by two-sided adhesive strips 43 is then fitted over the upstanding portions of the printed pattern. The bars 51 and 52 are then withdrawn, the latter bars stripping a protective paper strip 44 from each of the lower adhesive strips. The next stage of assembly comprises mounting the other printed pattern, Fig. 3, in a jig consisting of bars 53 to 57 and folding the zopes between the lines 2-6, 5-3 upwards as previously described. This operation includes the steps of bending over and clamping with bar 57 the flap parts of the pattern obtained by cutting along the dotted lines. This jig in turn is lowered on to the upstanding portions of the Fig. 2 printed pattern and the bars 53 removed. The upstanding portions are now in contact with the bent-over portions of the upper pattern, and the conductors are joined together by the use of a heating element in bars 55 and suitably tinned and fluxed conductors on the printed patterns, or by ultrasonic welding or heating by passing current through the conductors. Finally the two parallel groups of conductors passing through each core are separated by the use of knife-edged blades 56. It is stated that relative movements of the bars may be effected by the use of compound bar structures made up of tapered parts, Fig. 6 (not shown). An alternative arrangement is described in which the operation of passing flaps of insulating material having a conductive pattern through the cores is replaced by the use of separate films of printed insulating material. Initially the pattern of conductors passing through each core is printed on an insulating film attached to spring strips 91, Fig. 9A, which are bonded together at regular intervals 92. These strips are temporarily straightened by tensioning, and cores 41 are threaded on and positioned at each point 92. When the tension is removed, the spring strips take up the configuration shown in Fig. 9B. Compression is then applied and the cores are brought together as shown in Fig. 9C. The insulating films are then in contact with the cores and are held to them by the use of pressuresensitive adhesive. The spring strips are then detached from the printed films by retensioning, and the cores are separated prior to removal by cutting each upstanding loop of the films. The printed film-fitted cores 41 are connected to the co-ordinated patterns as shown in Figs. 7 and 8 by the use of any of the joining methods previously described. In Fig. 7 the core film 75 has an upturned part 74 which abuts an upturned part of the upper pattern 72. This arrangement prevents heating of the core when the joining operation is carried out. In Fig. 8 the cores 41 ends lie between flat upper and lower patterns 73, 71 and the core apertures include a stiff insulating separator 76. Connections between matrices lying in the same plane are made as shown in Fig. 10, the folded ends of the pattern 21, 31 of each matrix being insulated from its co-ordinated pattern by paper strips 101. It is stated the matrix construction described permits the assembly of a stack of matrix planes to form a three co-ordinate array.