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:
Apr. 17, 1979
Filed:
Aug. 22, 1977
Andre Jaecklin, Ennetbaden, CH;
BBC Brown, Boveri & Company, Limited, Baden, CH;
Abstract
A semiconductor device including at least four zones of alternately opposite conductivity types, the two inner zones and the outer zone adjoining each of them in each case possessing a common surface, on which there is provided a main electrode making contact with both the inner and the outer zone, the first main electrode comprising a central recess in which the first inner zone is in contact with a control electrode, and there being on the surface of the two inner zones heavily doped regions, surrounding the two outer zones, of the same conductivity type as the adjoining inner zone and which are at a distance of at least two carrier-diffusion lengths for the purpose of forming a guard zone for the outer zone disposed on the same surface, and wherein there is provided on the surface of an inner zone, between the outer zone disposed on the same surface and the heavily doped region surrounding that outer zone, an annular guard zone of the opposite conductivity type to that of the adjacent inner zone.