SE363434

• Main Author: COUCOULAS A,US
• Format: Patent
• Language: English
• Published: 14.01.1974
• Subjects: BASIC ELECTRIC ELEMENTS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; PRINTED CIRCUITS; SEMICONDUCTOR DEVICES

1,264,271. Welding by pressure. WESTERN ELECTRIC CO. Inc. 6 May, 1970 [7 May, 1969], No. 21774/70. Heading B3R. In a method of simultaneously bonding metallic wires to spaced regions on one or more substrates, a wire 20 is wound about and secured to a compliant member 19, the latter and the wire is severed to leave wire portions 21 secured to the compliant member and to deform the member and wire to produce visible marks 24 which are then used to align the wire portions with the regions. As shown, electrical leads to be bonded to spaced conductive lands on an integrated circuit substrate are formed by winding a gold filament 20 about a compliant support 19, which may comprise a strip of aluminium foil having a surface oxide, or PTFE. The support can have edge notches 23 to locate the turns of the filament. An adhesive tape 22 or an insulating varnish is used to secure portions of the filament to the support 19. Edge portions of the latter, including portions of the filament thereon, are removed as along lines a, a to leave a number of spaced conductors 21 (Fig. 3a) on the support. During the edge portion removal operation visible marks 24 are formed on the support. Using these as guides, the conductor end portions are placed in overlapping relation with the lands (13) (Fig. 4, not shown) and bonding energy applied through the support. The energy can be in the form of ultrasonic or acoustical vibrations and/or heat and pressure. During bonding, an end portion of each filament, bonded to respective lands, is slightly flattened. The lands can be gold-plated. In modifications (not shown), the edge notches 23 are replaced by apertures adjacent the edges, the filament being threaded therethrough; and the inter-turn distances are non- uniform and/or in different configuration(s) from that of the above description. Specification 1,239,631 is referred to.