Patent ID: 7418956

Claim:
An ignition apparatus for an internal combustion engine comprising: an ignition coil having a primary coil and a secondary coil; a spark plug that is arranged in a combustion chamber of said internal combustion engine and is connected to a high voltage side terminal of said secondary coil; and a coil driver that drives said ignition coil; wherein said coil driver includes: a switching element that controls a primary current flowing through said primary coil based on an ignition signal; an IC that shapes the waveform of said ignition signal supplied to said switching element; and a turn-on voltage prevention circuit that is inserted between a low-voltage side terminal of said secondary coil and a ground; wherein said turn-on voltage prevention circuit is composed of a parallel circuit comprising a diode in the form of a bare chip and a thick film resistor, and is mounted on the same substrate together with said IC.