| 摘要 |
PURPOSE:To enhance the dielectric strength of the ends of metal sheets without introducing an impurity to the end of a winding by bonding projected portions of insulating sheets from the metal sheet to adjacent insulating sheets. CONSTITUTION:Insulating sheets 22, 22' wider than a metal sheet 21 are disposed at both sides of the sheet 21 which forms a winding, and the sheets 21 and 22, 22' are superposed and wound to constitute high and low voltage windings. Projected portions of the sheets 22, 22' from the sheet 21 are bonded by means such as heating on the way of winding to enclose the sheet 21, thereby winding a winding. The insulating sheets may not be bonded on the way of winding the winding but may be bonded after winding. Since the end 23 of the sheet 21 is protected by the sheets 22, 22', it can prevent an impurity from being introduced into the end of the sheet to obtain a foil wound transformer having high reliability.
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