| 摘要 |
<p>PROBLEM TO BE SOLVED: To permit the magnetic shield with keeping at a low cost, without lowering the secondary voltage by placing a grain-oriented silicon steel sheet- made magnetic shield plate outside or inside an insulation case. SOLUTION: A grain-oriented silicon steel sheet-made magnetic shield plate 3h is bent like a U-letter and disposed outside an insulation case 3f with each plane parallel to a core, a ferrite core, a primary coil bobbin wound with a primary coil and secondary coil bobbin wound with a secondary coil are hosed in the insulation case 3f and insulated and settled with a charged thermosetting resin, and a U-shaped or square magnetic shield plate 3h with each plane parallel to the core or magnetic shield plate 3h formed to cover the entire inner wall of the insulation case 3f may be disposed inside the insulation case 3f.</p> |
