Magnet ignition device

Claim 1

A magnet ignition device comprising: a power source which produces positive and negative output signals in synchronism with the rotation of an engine, rectifies the output signals, and applies the rectified signals into an ignition coil; a switching element for controlling the current passage of said ignition coil; a single angular position detecting device for producing in synchronism with the rotation of said engine a first angular signal with one polarity corresponding to a given crank angular position of said engine and said single angular position detecting device also producing a second angular signal with a polarity opposite the polarity of said first angular signal and said second angular signal being supplied directly to said switching element, which second angular signal corresponds to a crank angular position delayed by a given angle with respect to said given angular position where said first angular signal is produced and where said second signal has a wider angular width than that of said first angular signal; an ignition timing operation circuit which operates by establishing a reference position in response to the occurrence of said first angular signal to compute an ignition timing in accordance with a running condition of the engine regardless of the amplitude and shape of said first angular signal in order to produce an output signal; and a control circuit for controlling the bypassing of said second angular signal as a result of said output signal produced as a result of the operation of said ignition timing operation circuit.