| 摘要 |
PURPOSE:To increase the optical output of a luminescent diode as well as to contrive accomplishment of miniaturization, lightweightedness and low cost of production of the title current transformer by a method wherein, in the current transformer in which a luminescent diode is connected, a magnetic core is formed with an amorphous magnetic material having a specific composition in the shape having no air-gap in its magnetic path. CONSTITUTION:By the formation of a magnetic core 31 using the amorphous magnetic material having the specific composition of (a), (b) and (c), excellent characteristics can be maintained even when a heat treatment is performed in a non-magnetic field. To be more precise, the composition (a) has Cr of 2-15 atomic %, (b) has the total quantity of 10-27 atomic % of Si and B, provided that the density of B is 5 atomic % or more, end (c) has the remaining part of Fe substantially. An Fe radical amorphous magnetic material is low in cost, its saturated magnetic flux density is high, and also the magnetic-core characteristics can be improved by Cr in a heat treatment performed in a nonmagnetic field. Especially in the composition of Cr of 3-10 atomic %, the characteristics of magnetic core can be made excellent. Also, in the composition outside said compositional range, the formation of amorphous magnetic core becomes difficult with B and Si. Therefore, it is desirable especially to have the range of composition of B 8-10 atomic % and Si of 10-15 atomic %. |
