Patent ID: 7414508

Claim:
A common mode choke coil, comprising: a first helical coil unit having a plurality of elongate first conductive layers arranged in parallel on a bottom insulation layer, second conductive layers formed on both ends of the first conductive layers; and a third conductive layer formed on the second conductive layers, which is electrically connected to the second conductive layer at one end thereof and which is electrically connected, at another end thereof, to the second conductive layer formed on the first conductive layer adjacent to the first conductive layer directly under the second conductive layer, one turn of the coil being formed by the first conductive layer, the second conductive layer, the third conductive layer and the another second conductive layer; and a second helical coil unit having a configuration similar to that of the first helical coil unit, wherein a first imaginary plane including three conductive layers among the first, second, third, and the another second conductive layers forming one turn of the coil of the first helical coil unit and a second imaginary plane including three conductive layers among the first, second, third, and the another second conductive layers forming one turn of the coil of the second helical coil unit are substantially orthogonal to axes of spiral of the first and second helical coil units.