High-voltage transformer and a vehicle-lamp lighting-on device using the same

摘要

In a high-tension transformer, an insulating ring (70) is placed on and along the inner surface of the core housing (31), and gaps (72) and (73) are formed between the tips of the flange-like plates (41) of the coil bobbin (40) and the inner side of the insulating ring (70). With such a construction, the gaps (72) and (73) and the insulating ring (70) are provided between the coil bobbin (40) and the inner wall of the core housing (31), so that the flange-like plates (41) of the coil bobbin (40) do not come in contact with the inner surface of cylindrical wall (34) of the core housing (31). Therefore, a surface distance of the coil bobbin (40) ranges to a contact surface of the coil bobbin (40) where it comes in contact with the front wall of the core housing (31). The surface distance is elongated. The voltage drop by the creepage discharge does no occur.