| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve thermal insulation effect on a bias circuit from a transformer and reduce a size of whole device. SOLUTION: When storing in an outer packaging case 16 electric parts such as a transformer which induces high voltage to the high voltage side of a secondary coil 112 by a current cut off of a primary coil 111, a switching element 12 which carries out a cut-off control of current of the primary coil 111, and a bias circuit 13 which applies to the low voltage side of the secondary coil 112 of the transformer a positive polarity voltage for detection ion generated when discharge occurs in an ignition plug due to an application of high voltage generated at the high voltage side of the secondary coil 112, the bias circuit 13 is stored inside the outer case 16 so as to be disposed at a position adjacent to the switching element 12 and a position away from the transformer, and is filled with a casting resin 17.</p> |
