Patent ID: 7652550

Claim:
A high-voltage generating transformer for a discharge lamp lighting apparatus comprising: a core made of a rodlike magnetic material; a secondary winding bobbin that is divided into a plurality of sections, and where the core is disposed in the central portion thereof; a secondary winding part wound on the secondary winding primary winding bobbin, divided between the plurality of sections of the bobbin; a primary winding primary winding bobbin disposed around the outer periphery of the secondary winding part; and a primary winding part wound on the primary winding bobbin, wherein the primary winding bobbin is changed in thickness every section or every plurality of sections of the second winding part such that the bobbin has a thickened thickness on the side where the potential difference between the primary winding part and the secondary winding part is high, and that the bobbin has a thinned thickness on the side where the potential difference is low, and wherein the primary winding part is wound thereon by winding a plurality of wires in parallel.