Ceramic Heater and Glow Plug Using the Same
AssigneeKYOCERA Corporation
InventorsHiroyuki ARIMA, Masao YOSHIDA
Life of this patent
Estimating the term…
Abstract
The protrusion 16 is formed on one end face of the ceramic member 11, and the positive electrode lead-out section 13a which is electrically connected to the heat generating member 12 is drawn out and exposed on the side face of the protrusion 16 at several positions, while the terminal 14 of the positive electrode lead-out fixture can be connected to each of the exposed portions.
Claims11
1-4. (canceled)
A ceramic heater comprising:
- a main body formed from electrically insulating ceramics;
- a heat generating resistive member embedded in the main body at the distal end thereof;
- a positive electrode lead-out section electrically connected to the heat generating resistive member;
- and
- an electrode lead-out hole formed in the base end of the main body with the positive electrode lead-out section exposed on the inner surface thereof, wherein
- the electrode lead-out hole has substantially circular cross section, and the ratio of minor axis length B to major axis length A of the cross section is in a range of 0.8≦B/A≦I.
A method for manufacturing a ceramic heater having an electrode lead-out hole of substantially circular cross section formed in the main body made of electrically insulating ceramics at the base end thereof, comprising:
- firing a green ceramic compact which would become the main body when fired, with a hole forming member made of carbon having density of 1.5 g/cm3 or higher embedded therein, in an inert gas atmosphere or reducing atmosphere;
- and
- removing the hole forming member by burning in oxidizing atmosphere.
A method for manufacturing a ceramic heater having an electrode lead-out hole of substantially circular cross section formed in the main body made of electrically insulating ceramics at the base end thereof, comprising:
- firing a green ceramic compact which would become the main body when fired, with a hole forming member made of carbon having density of 1.5 g/cm3 or higher embedded therein, in an inert gas atmosphere or reducing atmosphere;
- and
- removing the hole forming member by means of water jet.
Dependencies are inferred from the claim text.