MANUFACTURE OF PORCELAIN CAPACITOR

• Main Authors: ARAKAWA HAJIME, YAMAOKA OSAMU, KAKIO GENMEI
• Format: Patent
• Language: English
• Published: 31.01.1989
• Subjects: APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL; BASIC ELECTRIC ELEMENTS; CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES ORLIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE; ELECTRICITY; PERFORMING OPERATIONS; PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL; SPRAYING OR ATOMISING IN GENERAL; TRANSPORTING

PURPOSE:To contrive improvement in the withstand voltage characteristics of a porcelain capacitor by a method wherein a region, having the insulation resistance value which is especially smaller than that of the other part, is formed on the porcelain dielectric located under the edge part of an electrode, and the potential inclination at the insulating part of the electrode is alleviated. CONSTITUTION:An electrode material mainly composed of the metal, having an intensive oxidizing property, is coated on the two opposing main surfaces of a disc-like porcelain dielectric 13 mainly composed of a metal oxide. Then, a gap is provided between the edge of the dielectric 13 and the electrode material. Electrodes 14a and 14b are formed by baking the electrode material on the surface of the dielectric 13 by heating the whole body of the above- mentioned material. Vitreous insulating layers 15a and 15b which shut off air are coated in ring form astriding the part ranging the edge part of the electrodes 14a and 14b the dielectric 13. Then, said insulating layers 15a and 15b are baked. As a result, the potential inclination on the edge part of the electrodes can be alleviated, and the porcelain capacitor having large dielectric strength can be obtained.