CERAMIC HEATER AND GLOW PLUG

摘要

A ceramic heater includes a substrate containing a ceramic, and a resistor containing another ceramic and embedded in the substrate. The resistor includes two lead portions, a joint portion connecting the two lead portions, and an electrode portion formed integrally with at least one lead portion and extending in a direction crossing an axial line of the one lead portion. The electrode portion has a base end portion connected to the one lead portion, a distal end portion exposed at an outer surface of the substrate, and a connection portion disposed between the base end portion and the distal end portion and connecting the base end portion and the distal end portion together. A cross section of either the base end portion, the distal end portion, and the connection portion has an imaginary plane perpendicular to an extension direction of the electrode portion and has a streamline shape.

主权项

1. A ceramic heater comprising:
a substrate containing a ceramic; and a resistor embedded in the substrate and containing another ceramic, the resistor including;
two lead portions extending parallel to each other,a joint portion that connects one end of a lead portion to one end of another lead portion, andan electrode portion that is formed integrally with at least one lead portion of the two lead portions and extends in a direction crossing an axial line of the one lead portion, the electrode portion having a base end portion connected to the one lead portion, a distal end portion exposed at an outer surface of the substrate, and a connection portion disposed between the base end portion and the distal end portion and connecting the base end portion and the distal end portion, wherein a cross section of at least one of the base end portion, the distal end portion, and the connection portion has an imaginary plane perpendicular to an extension direction of the electrode portion, and said cross section having a streamline shape.