High voltage driving device

A high voltage driving device comprising:

• a housing;
• and
• a cathode, an anode, and an insulation structure, which are disposed in the housing,
• wherein the cathode and the anode are spaced apart from each other with the insulation structure therebetween,
• wherein the insulation structure comprises:
• a first solid insulator disposed adjacent to the cathode;
• and
• a second solid insulator disposed adjacent to the anode,
• wherein the first solid insulator has first volumetric resistivity less than second volumetric resistivity of the second solid insulator, and the first solid insulator contacts the cathode,
• wherein each of the first solid insulator and the second solid insulator comprises alumina (Al2O3) and titania (TiO2) doped in the alumina,
• the titania doped in the alumina of the first solid insulator has a concentration of about 2% or more, and
• the titania doped in the alumina of the second solid insulator has a concentration less than about 2%.

A high voltage driving device comprising:

• a housing;
• and
• a first electrode, a second electrode, and an insulation structure, which are disposed in the housing,
• wherein the first electrode and the second electrode are spaced apart from each other with the insulation structure therebetween,
• wherein the insulation structure comprises:
• a pair of first solid insulators respectively disposed adjacent to the first electrode and the second electrode;
• and
• a second solid insulator disposed between the first solid insulators,
• wherein the first solid insulator has first volumetric resistivity or first permittivity less than second volumetric resistivity or second permittivity of the second solid insulator, the first volumetric resistivity being sufficiently small to suppress a charging phenomenon on a surface of each of the first solid insulator, and
• wherein the first solid insulators respectively contact the first electrode and the second electrode.