Patent ID: 7872556

Claim:
A magnetic assembly, comprising: a mounting substrate; and a magnetic element mounted on the mounting substrate, the magnetic element including a drum core including a winding shaft and a flange portion at each end of the winding shaft, each flange portion including a flange surface; a coil wound on the winding shaft; and a shield core engaged with the drum core, the shield core including an engagement portion having a shape that corresponds to the shape of a portion of an outer circumference of at least one of the flange portions so that the engagement portion mates with the at least one flange portion, and 0.5× S 1 ≦S 2≦5× S 1 where S 1 is a cross-sectional area of the winding shaft in a direction parallel to the flange surface, and S 2 is a cross-sectional area of the shield core in the direction parallel to the flange surface.