Patent ID: 7071803

Claim:
A micro surface mount coil unit comprising: a coil unit body having a drum-shaped core having a coil form part around which a coil wire is wound and flange parts provided at both ends of said coil form part; and a lead frame which has a flange part mounting plate for mounting one of said flange parts of said drum-shaped core on the inside surface thereof and a conductive connecting terminal connected to a conductive part of a circuit board and is held by said one flange part, wherein said flange part mounting plate is formed of a flat plate member; wherein an outside surface of said flange part mounting plate is formed by a first region which is connected to said conductive part and functions as said conductive connecting terminal and a second region which is not connected to said conductive part and does not function as said conductive connecting terminal; and a molten solder spread preventing portion having any one of a notch, through hole, and groove is provided at least at a part of a boundary portion between said two regions.