Patent ID: 8242873

Claim:
A transformer comprising: a first core and a second core that each includes a magnetic center leg and a magnetic outer leg positioned outside of the magnetic center leg; a first adhesion part that adheres the magnetic center leg of the first core and the magnetic center leg of the second core to each other; a second adhesion part that adheres the magnetic outer leg of the first core and the magnetic outer leg of the second core to each other; a bobbin on which a primary coil and a secondary coil are wound, the bobbin being inserted through the magnetic center leg of the first core and the magnetic center leg of the second core; and a heat shrinkable tube that contacts an area proximate to the second adhesion part to apply pressure to the magnetic outer leg of the first core and the magnetic outer leg of the second core in an inward direction of the transformer, wherein the heat shrinkable tube has an internal diameter before heat shrinkage that is larger than an outer diameter of the transformer in a direction orthogonal to the magnetic center legs, and has an internal diameter after heat shrinkage that is smaller than the outer diameter of the transformer.