Patent ID: 6927658

Claim:
A drum type core comprising: a single-flanged cylinder structured such that a cylinder portion has a flange portion integrally connected with its one end and has nothing on the other end, and such that a coil is wound around the cylinder portion; and a counterpart flange piece prepared separately from the single-flanged cylinder, and having on its inner side an engaging hole into which the other end of the cylinder portion of the single-flanged cylinder is inserted and concurrently having on its outer side blind holes into which terminal pins are inserted, the counterpart flange piece being formed of a material different from that of the single-flanged cylinder, wherein the single-flanged cylinder has a higher permeability and saturation flux density than the counterpart flange piece, while the counterpart flange piece has a higher surface electrical resistance than the single-flanged cylinder, and the terminal pins are directly provided on the blind holes of the counterpart flange piece with no intermediate member.