| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an ignition coil which can prevent an outer peripheral core from being rusted by making the diameter of the coil smaller, and also a method of manufacturing the ignition coil. <P>SOLUTION: An ignition coil 1 includes primary and secondary windings 21, 22 overlapped at inner outer periphery, a central core 23 of a soft magnetic material located at the inner periphery side of the primary and secondary windings 21, 22, a coil case 41 for accommodating the central core 23 and the primary and secondary windings 21, 22, and an outer peripheral core 3 of the soft magnetic material located at the outer peripheral side of the coil case 41. The outer peripheral core 3 includes such a shape as to have a notch-shaped slit 32 along its axial direction by processing a plate-like electromagnetic steel plate into an arc shape. A surface exposure area of the outer peripheral core 3 at its outer periphery including a slit formation area is covered with a coating film 6 made of a heat shrinkable film. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
