Patent ID: 7119649

Claim:
A common mode noise filter comprising: a first insulating layer having a top surface and a bottom surface, the first insulating layer being made of magnetic material; a first conductor provided on the top surface of the first insulating layer; a second insulating layer having a top surface and a bottom surface, the bottom surface of the second insulating layer being located on the first conductor, the second insulating layer being made of nonmagnetic material; a second conductor having a spiral shape provided on the top surface of the second insulating layer, the second conductor having a first end and a second end, the second end of the second conductor being connected with the first conductor, the first conductor and the second conductor providing a first coil; a third insulating layer having a top surface and a bottom surface, the bottom surface of the third insulating layer being located on the second conductor, the third insulating layer being made of nonmagnetic material; a third conductor having a spiral shape provided on the top surface of the third insulating layer, the third conductor having a first end and a second end, the third conductor facing the second conductor across the third insulating layer; a fourth insulating layer having a top surface and a bottom surface, the bottom surface of the fourth insulating layer being located on the third conductor, the fourth insulating layer being made of nonmagnetic material; a fourth conductor connected with the second end of the third conductor, the third conductor and the fourth conductor providing a second coil; a fifth insulating layer provided on the fourth conductor, the fifth insulating layer being made of magnetic material; a first lead electrode connected with the first conductor; a second lead electrode connected with the first end of the second conductor; a third lead electrode connected with the first end of the third conductor; and a fourth lead electrode connected with the fourth conductor, wherein the third insulating layer is thicker than the second insulating layer and the fourth insulating layer.