Spark-producing arrangement for a lighter with a battery

Claim 1

A spark-producing circuit comprising a source of D.C. voltage, an oscillating means including spark means coupled to said course of D.C. voltage, a sensing means placed adjacent said flame and sensing the presence of the flame for turning off said oscillating means when a flame is present, said oscillating means comprises a voltage transducer means having a primary, a secondary and a feedback winding, a transistor device having a base electrode connected to said feedback winding, a primary winding connected to said collector electrode, a voltage dividing circuit including said sensor means connected through said feedback winding to the base electrode of said transistor device, an operating switch means connecting said voltage divider circuit to one terminal of said D.C. voltage source, a discharge circuit connected to said secondary winding and including a storage capacitor means and a thyristor device connected in a series therewith and capable of producing a high voltage pulse when the charge in said storage capacitor attains a predetermined breakdown voltage of said thyristor means, a high voltage step-up transformer means having a primary winding connected in series with said storage capacitor means and said thyristor means and a secondary winding, a spark gap means connected in series with said secondary winding of said step-up transformer means, whereby a spark is produced in said spark gap means when said storage capacitor discharges over said thyristor device.