The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 16, 1980
Filed:
Aug. 22, 1979
Hitachi, Ltd., , JP;
Abstract
A main thyristor region is formed which comprises four continuous layers of alternately different conductivities consisting of first, second, third and fourth layers, PNPN for example. The main thyristor region constitutes a main thyristor section together with a couple of main electrodes in ohmic contact with the outside ones of the four layers. A pilot thyristor section and an auxiliary pilot thyristor section are constituted by employing the first, second and third layers of the main thyristor section and the main electrode in ohmic contact with the outside of the first layer and further by introducing fifth and sixth layers for forming PH junctions with the third layer. Further, there are provided a gate means for turning on the pilot thyristor section and an auxiliary gate means being in contact with the fifth or sixth layer. The auxiliary pilot thyristor section, main thyristor section and pilot thyristor section are formed in such a way that the respective triggering voltages satisfy the following relation: