Patent ID: 7359176

Claim:
A board for ion generation, comprising: a substrate formed of ceramics; a discharge electrode formed on one principal surface of the substrate; an induction electrode formed on another principal surface of the substrate; a first protective layer formed so as to cover the discharge electrode on the one principal surface of the substrate; and a second protective layer formed so as to cover the induction electrode on the other principal surface of the substrate, wherein the discharge electrode and the induction electrode are disposed opposite to each other, wherein by applying an AC voltage between the discharge electrode and induction electrode, surface discharge directed from a zone above the discharge electrode toward a zone above an end of the induction electrode and surface discharge directed from the zone above the end of the induction electrode toward the zone above the discharge electrode are generated alternately on the surface of the first protective layer, and wherein porosity of the substrate is 5 to 10 vol. %.