Patent ID: 9424982
Filing Date: 2016-08-23
CPC Classification: H01F

Claim Text:
1. A transformer comprising: a bobbin, wherein the bobbin is provided with a cylinder portion on which a core leg penetrating hole, where a magnetic core is inserted, is formed, the cylinder portion is provided with a first winding part where a first wire, forming either one of a primary coil or a secondary coil, is wound, and a second winding part where a second wire, forming the another one of the primary coil or the secondary coil, is wound, at a position different from the first winding part in an axial direction, at an outer circumference of the cylinder portion located between the first winding part and the second winding part, an insulating partition collar is formed, at least on the first winding part, a winding partition collar, separating mutually adjacent wire winding parts along a winding axis of the first wire in respective sections, is formed, at the winding partition collar, at least one communication groove, communicating the sections adjacent to each other, is formed, at least the first wire is α-wound around the first winding part, a lower part of a winding axis direction is a mounting surface of the transformer, and two pairs of split middle leg portions of two split cores having a U-shaped cross section are respectively inserted into the core leg penetrating hole from upper and lower parts of the winding axis direction.