Through-type capacitor with improved anti-tracking performance

Claim 1

A through-type capacitor comprising: a central conductor to be applied with a predetermined high potential; a dielectric member with the central conductor passing through the center thereof, the central conductor forming an electrode; another electrode arranged on the outer periphery of the dielectric member, the dielectric member and the electrodes making up a capacitor; a conductor plate connected to the other electrode to apply a predetermined low potential to the other electrode while at the same time coupling the dielectric member with an external member; a housing of an insulating material fitted on the conductor plate in a manner to surround the outer periphery of the dielectric member and having an opening along the axial direction of the central conductor; an insulating resin filled in a space between the housing and the dielectric member; and an anti-tracking resin film of an insulating material coated on the surface of the end of at least an opening of the housing of insulating material and on the inner and outer surfaces of the housing of insulating material adjacent to said end, said anti-tracking resin film having a higher anti-tracking performance than the housing of insulating material.