Patent ID: 6618929
Filing Date: 2003-09-16
Classification: H01F,Y10T

Abstract:
A method of making a laminated common-mode choke coil, comprising the steps of:forming a laminated structure having a plurality of layers including a pair of magnetic substrates and a first insulating layer interposed between said pair of magnetic substrates; forming first and second spiral-shaped coil electrodes on the different layers of said laminated structure; forming first through fourth external electrodes at the edges of said laminated structure, said first external electrode being connected to one end of said first coil electrode, and said third external electrode being connected to one end of said second coil electrode; and forming first and second through-hole electrodes through which said second external electrode is connected to the other end of said first coil electrode and said fourth external electrode is connected to the other end of said second coil electrode, wherein said first coil electrode extends from a connecting portion with said first external electrode, and overlaps said second coil electrode except at a position between said first and second through-hole electrodes.