| 摘要 |
PROBLEM TO BE SOLVED: To provide an insulating spacer maintaining insulating characteristic over the long term without enlarging the outer shape. SOLUTION: Rectangular shielding plates 2A, 2B are mounted on both sides of a perforated hole 1d formed in an insulating table 1A. The shielding plates 2A, 2B are fastened by a weld planting stud 3 welded to the inside surface of the shielding plates 2A and a nut 4, etc., to be fixed to the insulating table 1A. The insulating table 1A is provided with convex parts 1c forming concave parts on the outer periphery with respect to the mounted surfaces of the shielding plates 2A, 2B positioned on both sides of the perforated hole 1d. The convex parts 1c prevent formation of minute gaps between the convex parts 1c and the shielding plates 2A, 2B, also they prevent a corona discharge in the gaps of the concave parts formed on the outer periphery of the convex parts 1c. |
