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:
Sep. 19, 2000
Filed:
Jun. 29, 1999
Yoshiyuki Hirose, Itami, JP;
Kazutaka Sasaki, Itami, JP;
Mitsuru Shimazu, Itami, JP;
Hirohiko Nakata, Itami, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A ceramic base plate of aluminum nitride ceramics, for example, as a power module board has a metal layer on a surface of the ceramic base plate at a fixing portion at which the ceramic base plate is fixed onto a heat radiating plate. Further, a metal film is provided entirely on the rear surface of the ceramic base plate. An IGBT chip or the like is fixed onto the ceramic base plate with a conductive layer interposed therebetween, to form a power module board. Therefore, it is possible to avoid the generation of cracks when the ceramic base plate is mechanically fixed onto the heat radiating plate without using solder, and heat radiation from the ceramic base plate to the heat radiating plate can be improved.