Patent ID: 8872614

Claim:
A transformer, comprising: an iron core including a plurality of magnetic sheets stacked in one direction; a coil wound around said iron core such that a winding axis thereof is perpendicular to a stacking direction of said plurality of magnetic sheets; and an electromagnetic shield inserted between an inner peripheral surface of said coil and a magnetic sheet which faces said inner peripheral surface of said coil, wherein, when viewed from said stacking direction of said plurality of magnetic sheets, a slit is formed in a region not overlapped with said electromagnetic shield in a surface of the magnetic sheet which faces said inner peripheral surface of said coil, and a portion of said inner peripheral surface of said coil not overlapping said electromagnetic shield has a curved surface, said iron core includes the magnetic sheet which faces said inner peripheral surface of said coil, said slit is formed in a predetermined number of magnetic sheets aligned consecutively along said stacking direction of said plurality of magnetic sheets, and said slit is formed in said predetermined number of magnetic sheets such that there is no overlap between said slits in two magnetic sheets adjacent in said stacking direction of said plurality of magnetic sheets, of said predetermined number of magnetic sheets.