| 摘要 |
947,528. Semi-conductor devices. SIEMENSSCHUCKERTWERKE A.G. May 17, 1961 [June 28, 1960], No. 18030/61. Heading H1K. In a process for applying a terminal connecting member to a semi-conductor device which has electrodes consisting of a metal alloyed to the device, the electrode is re-melted by means of induction heating and attached to the terminal device by the molten alloyed metal. In the arrangement shown in Fig. 1, a rectifier device 19 is used which has been prepared by placing on a gold boron foil a disc of silicon of high resistivity and a gold antimony foil and heating the assembly under pressure in a graphite powder. This produces highly doped P and N zones with silicon gold eutectics on the disc surface which form the electrodes. This disc is placed on a silver-plated molybdenum block 17 previously hard soldered to a copper support 16. The upper connection is made to a hollow silver or copper cylinder 20 with a reduced slotted portion at its lower end. A silver foil 21 is introduced into the cylinder and held in contact with the rectifier by a graphite block 22 and weight 23. The copper block is supported in a holder 15 which may be raised to allow the insertion of the device when the lid 5 of a glass or quartz vacuum vessel is removed. The support is then lowered, the vessel exhausted and a 1.5 megocycle supply fed to a liquid cooled induction coil 9. The coil heats the connecting members so that heat is conducted to melt the eutectic and form the required connection. Fig. 2 shows an assembled rectifier device in which the upper contact device consists of a silver plated molybdenum disc 36 hard soldered to a contact cup 37. Connection to the upper terminal is made by a short length of braid 38 with end plugs 39, 40 which are nipped in the cups 37, 44. The enclosure of the device consists of a ceramic tube metallized at its ends to make connection to parts 43, 41. The edge of base 21 is flanged over and joined in vacuum relation to the connecting portion 41. Specification 863,010 is referred to. |
