Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2005-03-01
2005-03-01
Arbes, Carl J. (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S827000, C029S841000, C029S848000, C029S855000, C029S856000
Reexamination Certificate
active
06860004
ABSTRACT:
In a method of manufacturing a thermally conductive circuit board with high heat dissipation, high conductivity and high ground-connection, a sheet-like thermally conductive resin composition containing 70 to 95 wt. % inorganic filler and 5 to 30 wt. % thermosetting resin composition, a lead frame as a wiring pattern, and an electrically conductive heat sink with a metal pole placed therein are superposed, heated and compressed, and thus are combined to form one body. Consequently, a thermally conductive circuit board with a flat surface is obtained in which a grounding pattern is grounded to the heat sink inside the insulating layer. Thus, the grounding pattern and the heat sink can be connected electrically with each other in an arbitrary position inside the insulating layer of the thermally conductive circuit board. The method provides that a part of a lead frame and heat sink are connected not only mechanically, but also electrically, and allows an associated power module size to be reduced and its density to be increased.
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Hirano Koichi
Matsuo Mitsuhiro
Nakatani Seiichi
Yamashita Yoshihisa
Matsushita Electric - Industrial Co., Ltd.
Merchant & Gould P.C.
Nguyen Tai Van
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