Patent ID: 9715961
Date: 2017-07-25
CPC Classifications: H01F

Claim:
1. A pulse transformer comprising a winding core and a coil portion in which wires are wound around the winding core, wherein the coil portion comprises: a first general winding area in which the wires are mutually closely wound around the winding core; a second general winding area in which the wires continuing from the wires of the first general winding area are mutually closely wound around the winding core; and a low density winding area formed along a winding axis of the winding core between the first general winding area and the second general winding area and having a lower winding density of the wires along the winding axis than the first general winding area and the second general winding area, wherein the wires are wound around the winding core in two or more layers and the surface of the winding core is not exposed in the first general winding area and the second general winding area; and wherein a portion in which a pair of the wires in the first layer and a pair of the wires in the second layer are crossed is formed at least at one place in the low density winding area.