Abstract: The heat generating member in a ceramic glow plug is a coil embedded in the ceramic. The coil is wound to have a coil angle, i.e. an angle formed between the coil and a line parallel to the coil axis, of no more than 60.degree.. The ceramic may be a non-oxide ceramic, nitride ceramic, SiC ceramic, or the like.

Abstract: In a glow plug, a pair of ceramic rods having longitudinal bonding surfaces are used as a heating rod. A resistor including a heater, and a pair of lead portions connected to both ends of the heater and extending to rear ends of the ceramic rods is continuously disposed on one bonding surface of the ceramic rods. One of the lead portions extends through a hollow metal holder, while the other lead portion is connected to an external connecting terminal mounted through an insulating member.

Abstract: This disclosure relates to a ceramic heater excellent in thermal shock resistance, high temperature resisting property, and free from change in resistance value even in the repeated use of the heater at high temperatures. The heater comprises a heat resisting element of high melting-point metal embedded in a ceramic body of nonoxide selected from a group consisting of silicon nitride, sialon, aluminium nitride and silicon carbide.

Abstract: The disclosure relates to a ceramic heating device in the form of a cylindrical shape comprising a burnt cylindrical support core of heat-resistant ceramics, a ceramic element disposed around said support core, said element comprising (i) a burnt sheet of heat-resistant ceramics; (ii) a heat-generating resistor pattern, said pattern being hermetically sealed between said sheet; and (iii) a pair of exposed terminals provided onto said sheet and said core, said terminal being connected to said pattern and adapted to be coupled to power leads such that electric power is then applied to said pattern.