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:
Mar. 14, 1989
Filed:
Mar. 30, 1978
Applicant:
Inventor:
Peter Voss, Munich, DE;
Assignee:
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
357 38 ; 357 30 ; 357 55 ; 357 86 ;
Abstract
Light controllable thyristors in which the sensitivity to light of the thyristors has been increased by increasing the emitter shunt resistance for the auxiliary thyristor coupling to small area optical light guides. The shunt resistance is increased by providing one or more grooves in the base region between the light sensitive thyristor and the main power thyristor which provides that the control current must pass through a circuitous path toward lower regions of the base layer and, thus, increase the shunt resistance.