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:
May. 13, 2014
Filed:
Jul. 25, 2011
Nobutake Tsuyuno, Naka-gun Tokai, JP;
Hiroshi Hozoji, Hitachiota, JP;
Toshiaki Ishii, Hitachi, JP;
Tokihito Suwa, Hitachinaka, JP;
Kinya Nakatsu, Hitachinaka, JP;
Takeshi Tokuyama, Hitachi, JP;
Junpei Kusukawa, Hitachinaka, JP;
Nobutake Tsuyuno, Naka-gun Tokai, JP;
Hiroshi Hozoji, Hitachiota, JP;
Toshiaki Ishii, Hitachi, JP;
Tokihito Suwa, Hitachinaka, JP;
Kinya Nakatsu, Hitachinaka, JP;
Takeshi Tokuyama, Hitachi, JP;
Junpei Kusukawa, Hitachinaka, JP;
Hitachi Automotive Systems, Ltd., Hitachinaka-shi, JP;
Abstract
Heat radiation surfacesandof electrode lead framesandmake thermal contact with heat radiation membersvia insulation sheetsto dissipate heat from a power semiconductor elementto the heat radiation members (thick portions). Each of exposed areas of the heat radiation surfacesandand a surfaceof a mold material (sealing material) adjacent to the exposed area produce an uneven step from which either one of the exposed area and the surfaceadjacent to the exposed area projects. The step side surface formed between the convex surface and the concave surface of the uneven step has an inclined surfaceorso configured that an obtuse angle can be formed by the inclined surface and the convex surface and by the inclined surface and the concave surface for each.