Patent ID: 7924133

Claim:
An electrically conductive coil winding to be wound around a cylindrical portion of an electrically insulating coil bobbin, wherein the coil winding is comprised of a plurality of coil members of an end-defined ring shape coupled so as to be continuous in a predetermined winding direction, wherein the cylindrical portion is to be inserted into openings of the coil members from one end of the cylindrical portion and along a direction of a center axis of the cylindrical portion, wherein an insulating portion protruding outwardly relative to the center axis is integrally provided at the other end of the cylindrical portion, and a bobbin-side engagement portion for engagement between the coil bobbin and the coil winding is formed on a face of the insulating portion to be opposed to the coil member, the bobbin-side engagement portion being a first projection, wherein a winding-side engagement portion is provided on the coil member into which the cylindrical portion is first to be inserted, the winding-side engagement portion comprising a second projection and a depression, the second projection being provided on a face to be opposed to the insulating portion, the depression being provided on a reverse face of the face to be opposed to the insulating portion, the depression being engageable with the bobbin-side engagement portion, wherein a third projection of the coil bobbin comes into contact with the second projection of the winding-side engagement portion before the depression of the winding-side engagement portion engages with the bobbin-side engagement portion when the third projection is inserted into a slit and the coil bobbin is rotated in a second direction opposite to a first direction, wherein the third projection protruding outwardly relative to the center axis is provided on an outer peripheral surface between the one end and the other end of the cylindrical portion, wherein the coil member into which the cylindrical portion is first to be inserted, has a projection insertion portion extending from an inner periphery to an outer periphery thereof, the projection insertion portion being the slit between one end and the other end of the coil member, wherein the third projection is made to pass through the projection insertion portion during insertion of the cylindrical portion into the openings of the coil members, and wherein after the insertion of the cylindrical portion, the cylindrical portion is to be rotated in the first direction relative to the coil winding so that the third projection moves from one end toward the other end of the coil member, into which the cylindrical portion is first to be inserted, along the coil member whereby the third projection is located between the coil members and whereby the winding-side engagement portion comes into engagement with the bobbin-side engagement portion.