| 摘要 |
1,253,823. Semi-conductor devices. WESTINGHOUSE BRAKE ENGLISH ELECTRIC SEMI-CONDUCTORS Ltd. 19 May, 1969 [18 June, 1968], No. 28898/68. Heading H1K. A gate contact member 23 is urged into contact with a peripheral zone of one surface 2 of a semi-conductor wafer 1 by resilient means, e.g. a belleville washer assembly 21, acting against an insulating body 15 situated electrically between the gate contact member 23 and a main current contact member 12 contacting a central zone of the surface 2. Both contact members 12, 23 are, in the embodiment shown, provided with leads 11, 27 respectively, which pass through a central bore 17 in the insulating body 15 and are connected to terminals 8, 9 outside the housing 4. A flange 18 of the insulating body 15 is engaged by a further belleville washer assembly 13 to urge the first contact member 12 on to the central zone of the wafer 1. As shown the second contact member 23 comprises a central flat portion 22 and a dependent peripheral wall portion 24 which actually engages the gate zone of the wafer 1. In a second embodiment, however, the second contact member (23), Fig. 3 (not shown), comprises a central flat portion (22) from which extend two outwardly directed arms (53) having downwardly directed end portions (55) which engage the gate zone of the wafer (1). In this case the arms (53) are themselves resilient, and the central portion (22) is urged downwards by a spring (47) operating through an insulating bush (49) in a bore (46) in a relatively massive first contact member (12). The arms (53) extend out through slots in the member (12) and are covered by insulating sleeves (54). The bush (49), the central portion (22) of the second contact member (23) and the bore in the first member (12) accommodate a central gate head (27) bearing a head (51) at its lower end, which head is engaged by the central portion (22) of the member (23) and is insulated from the central zone of the wafer (1) by an insulating spacer (52). |
