Patent ID: 7213588

Claim:
An ignition device for an internal combustion engine comprising: a transformer having a primary winding and a secondary winding; a case composed of a case body ( 3 a ) receiving the transformer, and a high-tension tower having an opening portion, the case body and the high-tension tower communicating with each other through the opening portion; a plug boot fittingly attached to the high-tension tower; a cast insulating resin injected into the case body and cured to insulate and fix the transformer; a high-voltage connection terminal connected to one end of the secondary winding and closes the opening portion so that the cast insulating resin that has not been cured is prevented from entering the high-tension tower; a transformer output voltage control element received in the high-tension tower, which is electrically connected to the high-voltage connection terminal, and controls a voltage generated in the second winding in activating the transformer; and a spring provided in a through-hole of the plug boot, between the transformer output voltage control element and a spark plug, which electrically connects the transformer output voltage control element and the spark plug to each other, and urges the transformer output voltage control element toward the high-voltage connection terminal.