Transformer for ignitor

A transformer for an igniter in which a primary coil and a secondary coil are wound around a bobbin, comprising:

• a plurality of partition walls disposed on the bobbin so as to form a plurality of coil winding grooves corresponding to the secondary coil ranging from a low voltage step to a high voltage step in layers;
• and
• a plurality of resin leading grooves disposed on a plurality of side surfaces of the partition walls to harden a lamination layer portion of the primary and secondary coils with resin after the winding of the primary and secondary coils.

A transformer for an igniter in which a primary coil and a secondary coil are wound around a bobbin and resin is injected into a peripheral space of the bobbin, comprising:

• a plurality of partition walls disposed on the bobbin so as to form a plurality of coil winding grooves corresponding to the secondary coil ranging from a low voltage step to a high voltage step in layers, wherein a diameter of a most-outer circumference of a part of each partition wall is changed in a circumferential direction of the partition wall.

A transformer for an igniter in which a primary coil and a secondary coil are wound around a bobbin, comprising:

• a pair of twining protrusive portions, which are protruded from either a most-outer circumferential wall of a low voltage side end portion of the bobbin or an arbitrary point near to the most-outer circumferential wall of the low voltage side end portion of the bobbin in both tangent directions to the most-outer circumferential wall of the low voltage side end portion of the bobbin respectively to twine a winding finish end of the secondary coil, which is wound in a plurality of layers of coil winding grooves, and both a winding start end and a winding finish end of the primary coil, which is wound around an outer circumferential portion of the secondary coil, around the twining protrusive portions, and a total length of the twining protrusive portions is set to be equal to or lower than the diameter of the most-outer circumferential wall of the low voltage side end portion.

A transformer for an igniter in which a primary coil and a secondary coil are wound around a bobbin, comprising:

• a pair of positioning protrusive portions, each of which is disposed on at least one of a pair of partition walls surrounding a coil winding groove, in which either a winding start end or a winding finish end of the primary coil is placed, to twine both the winding start end and the winding finish end of the primary coil around the positioning protrusive portions.

A transformer for an igniter which is used for a vehicle head lamp control device comprising a high intensity discharge bulb disposed in a head lamp of an automobile, a ballast for supplying an alternating current power from a battery power source to the high intensity discharge bulb, an igniter for generating a high voltage pulse to start the discharge of the high intensity discharge bulb and a high voltage terminal for supplying a high voltage to the high intensity discharge bulb and in which the high voltage terminal penetrates through a central area of a bobbin and both a primary coil and a secondary coil are wound around the bobbin which has a plurality of coil winding grooves formed in layers, comprising:

• a secondary coil taking-in slit which is disposed in a direction perpendicular to a bending direction of a top end of the high voltage terminal around which the secondary coil is twined.