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NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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Filing date
Publication date
Application filed by NEC Corp, Nippon Electric Co LtdfiledCriticalNEC Corp
Priority to JP9068077ApriorityCriticalpatent/JPS5425174A/en
Publication of JPS5425174ApublicationCriticalpatent/JPS5425174A/en
PURPOSE: To increase the current surge durability, by providing a ring shaped layer of opposite conduction type on the surface of the cathode or anode layer and providing an electrode in the ring.