| 摘要 |
PURPOSE:To lower a magnetic loss by a method wherein at least CaO and SiO2 in a specific amount are added to an MnZn-based ferrite and, in addition, at least one kind of a specific metal oxide in a specific amount is added. CONSTITUTION:An oxide magnetic substance material is constituted in such a way that 0.05<=CaO<=0.3wt.% and 0.005<=SiO2<=0.1wt.% as subcomponents are contained in a ferrite whose main component is composed of an oxide of Mn, Zn and Fe and that at least one kind out of TiO2, CaO, CuO and SnO2 is a sintered body containing 0.005<=MxOz<=0.2wt.%. Thereby, it is possible to obtain a ferrite material whose magnetic loss is low. A switching power supply manufactured by using it can be made small, generates little heat and is highly efficient. |
