Patent ID: 6759935
Filing Date: 2004-07-06
Classification: B22F,H01F,Y10T

Abstract:
A process for producing a coil-embedded dust core by embedding a coil in magnetic powders comprising ferromagnetic metal particles coated with an insulating material, comprising:a first compression molding step wherein one portion of magnetic powders is filled in a molding die and then compression molded to form a lower core, a coil positioning step wherein said coil is positioned on an upper surface of said lower core in said molding die, a coil embedding step wherein another portion of magnetic powders is again filled in said molding die in such a way that said coil is embedded in these magnetic powders, and a second compression molding step wherein pressure is applied to said lower core and said coil in a direction of lamination thereof, wherein said coil is a single-wound coil formed of a conductor wire of flat shape in section, said conductor wire is wound in such a way that a major diameter direction of said flat section is perpendicular with respect to an axial direction of said coil, said conductor wire is fixed at one end and another end with terminal electrodes, respectively, and where said coil is positioned on the upper surface of said lower core, the terminal electrode located relatively near to said lower core is positioned on an upper surface of said conductor wire while the terminal electrode located relatively far away from said lower core is positioned on a lower surface of said conductor wire.