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:
Jul. 02, 1991
Filed:
Feb. 05, 1990
Mituhiko Kitagawa, Tokyo, JP;
Tsuneo Ogura, Kamakura, JP;
Hiromichi Ohashi, Yokohama, JP;
Yoshinari Uetake, Sagamihara, JP;
Yoshio Yokota, Tokyo, JP;
Kazuo Watanuki, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A semiconductor switching device includes a high resistance first base layer of n-type formed on a first emitter layer of p-type through a low resistance buffer layer of n.sup.+ -type, second base layer of p-type formed on the first base layer, second emitter layers of n.sup.+ -type separately formed on the second base layer, anode and cathode main electrodes formed in contact with the first and second emitter layers, and a gate electrode formed in contact with the second base layer. Part of the low resistance buffer layer is exposed to the surface of the first emitter layer and is made contact with the anode main electrode to constitute a shorting portion. The width of the shorting portion is set smaller than one tenth of that of the second emitter layer in a longitudinal direction.