Patent ID: 6856227

Claim:
A transformer for an igniter in which a primary coil and a secondary coil are wound around a bobbin, comprising: a plurality of disk-shaped partition walls disposed on the bobbin, around which the primary coil and the secondary coil are wound, so as to protrude from all circumferential surface of the bobbin in a radial direction of the bobbin and to form a plurality of coil winding grooves in layers; and a plurality of cut-out portions functioning as a coil taking-in portion and a plurality of coil delivery portions of the disk-shaped partition walls; wherein the cut-out portions functioning as the coil taking-in portion and the coil delivery portions of the disk-shaped partition walls are obtained by cutting out the disk-shaped partition walls in an almost tangent direction to the bottom surfaces of the coil winding grooves of the bobbin.