Patent ID: 7821368

Claim:
A thin film type common mode noise filter comprising: an insulation substrate; a first electric insulation layer formed on said insulation substrate; a first coil lead layer formed on said first electric insulation layer, wherein said first coil lead layer includes a first electrode and a second electrode, and a conductor line connected therebetween; a second electric insulation layer having a via hole formed on said first coil lead layer; a first main coil layer formed on said second electric insulation layer, wherein said first main coil layer includes a first electrode and a second electrode, and a helical coil connected therebetween, moreover, said first electrode is connected to said first electrode of said first coil lead layer via said via hole of said second electric insulation layer; a third electric insulation layer formed on said first, main coil layer; a second main coil layer formed on said third electric insulation layer; wherein said second main coil layer includes a first electrode and a second electrode, and a helical coil connected therebetween; a fourth electric insulation layer formed on said second main coil layer, which has a via hole; a second coil lead layer formed on said fourth electric insulation layer; wherein said second coil lead layer includes a first electrode and a second electrode, and a conductor line connected therebetween, and said first electrode is connected to said first electrode of said second main coil layer via said via hole of said fourth electric insulation layer; an electric insulation gluing layer formed on said second coil lead layer; and a magnetic material layer formed on said electric insulation gluing layer.