Patent ID: 8242871
Filing Date: 2012-08-14
Classification: H01F,Y10T

Abstract:
1. A transformer comprising: a bobbin including a core portion extending in an axial direction, and terminal bases fixed at both ends of the core portion in the axial direction; a plurality of terminal electrode regions provided on the terminal bases, each terminal electrode region being provided with a wire connection part; a primary coil comprising a plurality of primary wires each having a first winding portion wound over the core portion, a first connecting portion connected to the one of wire connection parts, and a first leading portion extending from the first winding portion to the first connecting portion; a secondary coil comprising a plurality of secondary wires each having a second winding portion wound over the first winding portion, a second connecting portion connected to remaining one of the wire connection parts, and a second leading portion extending from the second winding portion to the second connecting portion; and a hook part disposed between the core portion and one of the terminal electrode regions and configured to hook at least one of the first leading portion and the second leading portion, thereby preventing the at least one of the first leading portion and the second leading portion from projecting outward from the bobbin, wherein the core portion is provided with a plurality of partition walls arrayed in the axial direction for dividing the core portion into a plurality of wire winding sections, each partition wall being formed with a groove through which at least one of the first leading portions is passed; wherein the hook part is provided at a position such that one of the primary wires wound over one of the wire winding sections is passed through all grooves present between the one of the wire winding sections and the one of the terminal electrode regions; and wherein the hook part has a portion overlapping with the groove positioned nearest to the hook part as viewed in the axial direction.