In a transformer including a coil part having a first bobbin to which a coil is mounted, a second bobbin to be fitted to the first bobbin combined to each other, the coil part being sandwiched between magnetic cores from above and below, the first bobbin includes at least one lead drawing through holes on a periphery on the inner peripheral side of a coil mounting surface, and at least one of coil-drawn-leads of the coil is drawn through the lead drawing through hole. With this transformer, coming out of the coil-drawn-lead, displacement, and erroneous wiring are prevented, and hence the inserting capability of the coil is improved. Therefore, the workability is remarkably improved, and hence a product which is low in price can be provided.
1. A transformer comprising:
a coil part having a first bobbin to which a coil is mounted, a second bobbin to be fitted to the first bobbin combined to each other, the coil part being sandwiched between magnetic cores from above below; and
a plurality of drawn lead introduction walls on the bobbin,
wherein the first bobbin includes at least one lead drawing through holes on a periphery on the inner peripheral side of a coil mounting surface, and at least one of coil-drawn-leads of the coil is drawn through the lead drawing through hole,
the drawn lead introduction walls are positioned adjacent the at least one lead drawing through holes so as to extend substantially perpendicular with respect to the coil mounting surface, and
the drawn lead introduction walls are different in height from each other.
2. The transformer of claim 1 , wherein the shape of the lead drawing through hole is oval.
3. The transformer of claim 1 , wherein at least one of the magnetic cores comprises a lead avoiding notch for avoiding the coil-drawn-lead.
4. The transformer of claim 1 , wherein at least one of the magnetic cores comprises a lead avoiding step for avoiding the coil-drawn-lead.