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:
Jun. 20, 1989
Filed:
Dec. 09, 1987
Applicant:
Inventor:
Jun-ichi Nishizawa, Sendai-shi, Miyagi 980, JP;
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
357 30 ; 357 58 ; 357 38 ; 357 56 ; 357 20 ;
Abstract
In a photothyristor provided with a cathode, a gate and an anode, the impurity densities of gate (base) portions 20 and 21 are made unequal to each other. The minority carriers are stored in the high impurity density regions 20, the majority carriers are permitted to readily pass through the low impurity density regions 21, and the high and low impurity density regions are electrically coupled together. This thyristor is extremely high in sensitivity and high-speed in operation.