| 摘要 |
PURPOSE:To prevent the generation of heat due to the concentration of current and magnetic flux and prevent the deformation of a foil winding due to an electromagnetic force, by disposing an insulator at a metal foil end portion in a lead wire connecting part. CONSTITUTION:A lead wire 25 is secured at its central part 25a to a metal foil 2 by means of spot welding, contact bonding or ultrasonic bonding. An insulator 26a is disposed at a side end part of the metal foil 2 where the lead wire 25 is connected, and further an insulator 26b is disposed at a side end part of the metal foil 2 where the end of the lead wire 25 is connected. Each of the insulators 26a, 26b has a width set to be 3mm. or more so as to be able to cover the portion of the metal foil having a length of about 2-3mm. from each side end part thereof where the concentration of magnetic flux easily occurs. The length of the insulator 26a is set so as to be larger than the width of the lead wire 25. On the other hand, the length of the insulator 26b only requires to be equal to the width of the lead wire 25. The current flowing while being distributed over the whole surface of the metal foil 2 can be prevented from concentrating near the lead wire 25. In addition, since the side end part of the metal foil 2 where the concentration of magnetic flux easily occurs is insulated, it is also made possible to prevent the generation of heat due to the concentration of magnetic flux. |
