| 摘要 |
1,007,459. Welding by pressure. WESTERN ELECTRIC CO. Inc. Aug. 21, 1962 [Aug. 30, 1961 (2)], No. 32018/62. Heading B3R. [Also in Divisions H1 and H4] A device for banding a fine wire to a part comprises an elongated member having at one end a banding head for transmitting pressure to the wire, the head having a groove with non-concave inner faces to engage the wire initially along lines of contact only. A device for bonding a very fine gold wire 12, Fig. 1, to an aluminium stripe 13 sputtered on a semiconductive body 14 comprises a steel member 16 having a pair of parallel tungsten cylinders 19 welded to the lower surface thereof to form a groove for the wire passed from a guide 22. The member 16 is mounted in a chuck 27, Fig. 4, on an arm 32 carrying a transducer mounted by wedges 37 in a carrier 36 and supplied with current at a frequency of 20-60 kc. per sec. Clamps 38, 39 on the carrier 36 are pivoted to a cradle 43 and the pressure exerted on the work by the member 16 is determined by a knob 76 carrying a pin 77 which may be spring urged into one of a number of slots in a plate 75, the knob carrying a cam operating on a sleeve between which and the carrier 36 is arranged a coil spring. In operation the semi-conductor body 14 soldered etc. to a header 86 is held by placing header leads 87 into apertures 88 in a support disc 89 on a fixture 92 adjustable for height and transverse location, the member 16 is brought adjacent the stripe on the semiconductor and the knob 76 is rotated to provide a force of about ten grams on the work. The transducer is energized to scrub the wire against the stripe resulting in bonding. The wire and/ or the stripe may be heated. In a modification the elongated member of glass, sapphire, quartz, diamond etc. has a V-shaped groove on a flat side, a chamfered edge and a flat portion for a round wire passed through a guide. In a further modification the elongated member has a passageway 187, Fig. 12, therethrough and is tapered at its lower end to provide a flat surface 193 to which are welded parallel tungsten cylinders forming a groove for the wire 12 passing down through the passage way 187. A shearing device 213 cuts the wire projecting from the elongated member and bends it through 90 degrees into the groove. This member is used in thermo-compression bonding also. The apparatus may be used to bond wires of copper etc. to conductive, semi-conductive or non- conductive parts. |
