| 摘要 |
PROBLEM TO BE SOLVED: To provide a ceramic heater capable of reducing problems caused by occurrence of cracking on an element molding in a manufacturing process. SOLUTION: This ceramic heater is provided with a heat generating element comprising an approximately U-shaped connecting portion connecting tip portions of a pair of rod-shaped lead portions, and electrode taking-out portions projecting to the outer peripheral direction from each of the lead portions, and composed of electrically conductive ceramic, and a base retaining the heat generating element and composed of insulating ceramic. The ceramic heater is manufactured by molding the element molding 31, then performing press molding for solidifying the circumference of the element molding with insulating ceramic powder to obtain a holding body, and degreasing and burning the holding body under a pressurized condition. At least base portions of the electrode taking-out portions 37, 38 of the element molding 31 are formed as varied portions 52 having curved faces 51 tapered toward an outer peripheral side, and both of a length R2 in the longitudinal direction of the varied portion 52 and a length R1 in the projecting direction orthogonal to the longitudinal direction are 0.5 mm or more. COPYRIGHT: (C)2007,JPO&INPIT
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