Electric heating – Heating devices – Resistive element: igniter type
Patent
1999-03-03
2000-08-29
Jeffery, John A.
Electric heating
Heating devices
Resistive element: igniter type
219544, 123145A, F23Q 700
Patent
active
061112232
ABSTRACT:
A ceramic heater is composed of an insulating ceramic heater body, a metallic sleeve fitted onto the ceramic heater body, a resistance heating element formed of a metal or a nonmetallic material and embedded in the ceramic heater body, and electrode leads. The length of a portion of the resistance heating element located inside the metallic sleeve is set equal to or greater than the length of a portion of the resistance heating element located outside the metallic sleeve. The resistance heating element has a heating portion which has a resistance per unit length which is twice that of the remaining portion or greater. The heating portion has a length 30 to 100% the length of the portion of the resistance heating element located outside the metallic sleeve.
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Jeffery John A.
NGK Spark Plug Co. Ltd.
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