| 摘要 |
<p>PURPOSE:To miniaturize an outside diameter by keeping a specific relation to the outside diameter of a small diameter section of a central conductor, the dimension from a large diameter section to the edge of the outside circumference and the projected distance from the mounting surface in the axial direction of a center conductor and by making the creeping shape approximately hyperbolic. CONSTITUTION:Epoxy resin 15 is cast and moulded annularly to the outside circumference of a cylindrical center conductor 11 and mounted, to a side wall 1c around the hole of a box body with a lug 15b on the outside circumference and a L-shaped fixture 16. Let the outside diameter of a small diameter section of the center conductor 11 be A, the distance between a large diameter section and the edge of the outside circumference be B and the projected distance from an earth potential section of an end face in the axial direction of the center conductor of the epoxy resin 15 be C, and let the relational dimension be 2B>A>=B>C. Then, the creeping shape in the axial cross section of the epoxy resin 15 from the small diameter section to the edge of the outside circumference will be approximately hyperbolic. The difference in polarity of a withstanding value against positive and negative impulse voltage applied across the center conductor 11 and mounting section can thereby be eliminated to miniaturize the external form.</p> |
