Sughrue Mion, PLLC
Ceramic heater and manufacturing method thereof
A ceramic heater including a columnar substrate and a heat generation resistor embedded in the substrate. A taper surface (12) having a contour L1 extending along an imaginary ellipse E is composed of a plurality of successively arranged curved surfaces which decrease in radius of curvature toward the forward end with respect to the direction of an axis P. The taper surface (12) is such that the distance between the end points M1 and M2 of the contour L1 is large in the direction of the axis P, and the angle between the axis P and a tangential line of the contour L1 on the side toward the forward end surface (11) is larger than the angle between the axis P and a tangential line of the contour L1 on the side toward the side circumferential surface (15).
NGK SPARK PLUG CO., LTD.
F F Y H H
F23Q F23Q Y10T H05B H01C
additional inventional additional inventional inventional
Shindo Kazuya
Watanabe Matsui