Low electric noise electrode system

A low electric noise rotor electrode system for an automotive distributor rotor, comprising:

• a first electrode and a metal second electrode separated from the first electrode by an air gap;
• said first electrode comprising,
• a metal electrode substrate,
• a first layer comprising a material selected from the group consisting of a metal oxide, an oxide resistor, and a mixture of an oxide dielectric substance and an oxide resistor, said first layer formed on the surface of said substrate, and
• a second layer comprising a material of which said first layer is formed but having a larger resistivity than that of said first layer, said second layer being formed on the surface of said first layer covering said first layer and having an exposed surface placed opposite said second electrode with the air gap between the exposed surface of the second layer and the second electrode so as to conduct a discharge between said exposed surface and said second electrode upon application of a sufficiently high voltage across said exposed surface and said second electrode.

An electrode for preventing noise electric wave according to the present invention comprising:

• a substrate;
• a first layer comprising oxide dielectric substance and oxide resistor, and being formed on the surface of said substrate faced to an opposite electrode;
• and
• a second layer comprising oxide dielectric substance, and being formed on the surface of said first layer faced to said opposite electrode, and having larger resistivity than that of said first layer.

An electrode for preventing noise electric wave according to the present invention comprising:

• a substrate;
• a high-fusing conductive material layer which is formed on the surface of said substrate faced to an opposite electrode, and which has the resistivity of not more than 10.sup.4 ohm centimeters, the fusing point of not less than 2000.degree. C., and the thickness of not less than 30 microns;
• and
• not less than one resisting material layer which is coated on the surface of said high-fusing conductive material layer faced to said opposite layer.

An electrode for preventing noise electric wave according to the present invention comprising:

• a substrate;
• and
• a resisting material layer which is coated on the surface of said substrate faced to an opposite electrode;
• wherein
• said substrate has a covering portion which is covered on the outer periphery of said resisting material layer, and which is located at the connecting portion between said substrate and said resisting material layer.

A method for producing an electrode for preventing noise electric wave according to the present invention comprising:

• a process for laminating a number of substrates;
• a process for forming a layer for preventing noise electric wave comprising a thermal sprayed layer which is formed on each edge surface of each substrate, and in which thermal spraying is performed in the direction approximately perpendicular to each edge surface, and which has the porosity of not more than 20%;
• and
• a process for separating said layer for preventing noise electric wave along a dividing line of each electrode substrate.

A method for producing an electrode for preventing noise electric wave according to the present invention comprising:

• a process for laminating a number of substrates having a spacer therebetween in which edge portion of each spacer is projected from the edge surface of each substrate by the predetermined length;
• a process for forming a layer for preventing noise electric wave comprising a thermal sprayed layer which is formed on each edge surface of each substrate, and in which thermal spraying is performed in the direction approximately perpendicular to each edge surface in such a manner that the thickness of said thermal sprayed layer is thinner than said predetermined length, and which has the porosity of not more than 20%;
• and
• a process for tearing said layer for preventing noise electric wave off from each spacer.

A method for producing an electrode for preventing noise electric wave according to the present invention comprising:

• a process for laminating a number of substrates;
• a process for forming a substrate thermal sprayed layer which is formed on each edge surface of each substrate, and in which thermal spraying is performed in the direction approximately perpendicular to each edge surface;
• a process for separating said substrate thermal sprayed layer along a dividing line of each substrate;
• a process for re-laminating each substrate coated with said substrate thermal sprayed layer;
• a process for forming a layer for preventing noise electric wave comprising a thermal sprayed layer which is coated on said substrate thermal sprayed layer formed on each edge surface of each substrate, and in which thermal spraying is performed in the direction approximately perpendicular to each edge surface of re-laminating substrate, and which has the porosity of not more than 20%;
• and
• a process for separating said layer for preventing noise electric wave along a dividing line of each substrate.

A method for producing an electrode for preventing noise electric wave according to the present invention comprising:

• a process for laminating a number of substrates;
• and
• a process for forming a layer for preventing noise electric wave comprising a thermal sprayed layer which is formed on each edge surface of each substrate;
• and in which thermal spraying is performed in the direction approximately perpendicular to each edge surface, and at the same time, said substrate is swung in order to repeat relative displacement between two edge surfaces of two neighboring substrates;
• and which has the porosity of not more than 20%.