| 摘要 |
PURPOSE:To decrease the unnecessary radiation for whole frequency band width by connecting a shield plate positioned on the primary side to the case of the unit and connecting a shield plate positioned on the secondary side to the outside conductor of a transmission cable through a shield material. CONSTITUTION:A shield plate 11 and a shield plate 12 are provided electrically insulated and facing each other in a specified interval. A core material 19 is positioned at the specified position on the these shield plates 11 and 12 passing through the plates. Windings 17 and 18 are wound on the positions of the core material 19 facing each other so as to be positioned on the sides of the shield plates 11 and 12. The shield material is provided so as to surround the shield plate 12, and the shield plate 11 is connected on the case 15 of the unit, and then, the shield plate 12 is connected through the shield material 20 on the outside conductor 23a of the transmission cable 23 whose core wire is connected to the winding 18. Whereby, the noise source is confined in the shield for both primary and secondary sides of the windings 17 and 18, providing the DC insulation for the primary and secondary sides. An unnecessary radiation is decreased for whole frequency band width, with inexpensive construction. |
