Patent ID: 6650068
Filing Date: 2003-11-18
Classification: C01G,C01P,C04B,H01J

Abstract:
An illumination unit comprising:a bulb containing discharge gas inside; an induction coil for generating an electromagnetic field with a frequency in a range of 50 kHz to 1 MHz is disposed in the bulb; and a power supply for supplying power to the induction coil, wherein the induction coil includes a core and a winding, and the core is made of a Mnâ€”Zn polycrystalline ferrite and has a Curie temperature of 270Â° C. or more, and wherein the Mnâ€”Zn polycrystalline ferrite includes an Ni element as an additive, the Ni element occupies 1 wt. % to 6 wt. % of all elements excluding oxygen in the Mnâ€”Zn polycrystalline ferrite.