| 摘要 |
In a first secondary-side bobbin 50 A, a roll surface of a winding section SA<SUB>2 </SUB>is located outward in radial direction with respect to a roll surface of a winding section SA<SUB>1 </SUB>in the vicinity of a groove 55 A, while a roll surface of a winding section SA<SUB>3 </SUB>is located outward in radial direction with respect to the roll surface of the winding section SA<SUB>2 </SUB>in the vicinity of a groove 56 A. Furthermore, the two winding sections SA<SUB>2</SUB>, SA<SUB>3 </SUB>cross each other so that the respective roll surfaces have substantially oval-coin-shaped cross sections and the respective major axis lines on the cross sections of the respective roll surfaces cross each other when viewed from the Y-axis direction.
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