Transformer and flat panel display device including the same

A transformer comprising:

• a bobbin part including inner and outer bobbins each including a pipe shaped body part having a though-hole formed in an inner portion thereof and a flange part protruding outwardly from both ends of the body part;
• coils respectively wound around the inner and outer bobbins;
• and
• a core electromagnetically coupled to the coils to thereby form a magnetic path,
• the inner bobbin being inserted into the through-hole of the outer bobbin to thereby be coupled to the outer bobbin and at least one of the inner and outer bobbins including the flange part having a width larger than a thickness of the body part,
• wherein the inner bobbin includes at least one fitting protrusion protruding from an outer peripheral edge of an upper flange part formed at an upper end of the body part in an outer diameter direction thereof,
• wherein an inner peripheral surface of the through-hole of the outer bobbin includes at least one coupling groove formed in a position in which the at least one coupling groove has the at least one fitting protrusion of the inner bobbin inserted thereinto,
• wherein the inner bobbin includes a support jaw protruding from a position corresponding to the fitting protrusion in an outer peripheral edge of the lower flange part formed at the lower end of the body part in the outer diameter direction, and supporting a lower surface of the lower flange part of the outer bobbin.