Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2005-05-26
2008-08-26
Trinh, Minh (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S605000, C029S606000, C336S200000, C336S090000
Reexamination Certificate
active
07415757
ABSTRACT:
A method for manufacturing a coil-embedded dust core with a small variation in inductance value with efficiency includes a step (a) of charging soft magnetic metal powder including an insulating material, composing a green body10, so as to cover a coil1, and (b) compacting the soft magnetic metal powder covering the coil1in an axial direction of the coil1. In the step (b), the soft magnetic metal powder is compacted while an amount of the soft metal powder charged into the part corresponding to the winding section is kept smaller than an amount of the soft magnetic metal powder charged into the other part that are not corresponding to the winding section, with an upper surface or a lower surface of the winding section as a reference.
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Moro Hideharu
Satoh Sadaki
Suzuki Tsuneo
Tamura Junetsu
Hogan & Hartson LLP
TDK Corporation
Trinh Minh
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