Patent ID: 7893805

Claim:
A transformer, comprising: a main body, having a primary winding partition, several secondary winding partitions and two end portions, wherein several leads are disposed in either end portion, a wire-guiding area is formed in a sunken area in the primary winding partition and a buffer region is formed between the primary end portion and the primary winding partition; and a secondary winding, wherein one end of the secondary wire runs from the secondary winding partitions to the wire-guiding area and, before the secondary wire goes into the buffer region, the secondary wire is folded for several times and then is twisted and rolled for several turns to make the secondary wire thicker, and then the secondary wire goes into the buffer region and then is connected to one of the primary leads, due to the wire-guiding area and buffer region, the secondary wire is not pressed and squeezed by the primary wire.