| 摘要 |
PURPOSE:To prevent the generation of deterioration of efficiency such as the lowering of Q of a coil by a method wherein the upper hole diameter of the externally provided metal shielding case is multiplied by the prescribed multiplier, thereby enabling the metal shielding case to come closer to the coil. CONSTITUTION:A coil 11 is wound around on the upper part of a bobbin 12, and a terminal plate 13 is constituted by thermosetting resin. A core 14 is screw- fitted into the center hole of the bobbin 12, and it performs a vertical movement to the coil 11. A core supporting molded member 15 is covered on the terminal plate 13 whereon the bobbin 12 is coupled, and a magnetic shielding core 16 is inserted in and retained on the core supporting molded member. Besides, a metal shielding case 17 having an aperture 17a on the upper surface is coated on the whole surface. According to this constitution, the effect of the metal shielding case 17 is reduced by having the diameter of the upper aperture 17a of the metal shielding case 17 formed 1.1-1.4 times larger than the upper aperture part 16a of a magnetic shielding core 16. |
