Ceramic heater, and glow plug using the same
US6720530B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 2002 |
| Grant date | Apr 13, 2004 |
| Priority date | — |
| Expiry date | May 1, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B2203/027
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A ceramic heater 1 includes a rodlike heater body 2 configured such that a ceramic resistor 10 is embedded in a ceramic substrate 13. The ceramic resistor 10 includes a front end part 11a and two large-diameter rodlike portions Ld. The large-diameter rodlike portions Ld form passages for supplying electricity to the front end part 11a, extend rearward along a direction of an axis O of the heater body 2, and have an electricity-supply sectional area greater than that of the front end part 11a. The large-diameter rodlike portions Ld each have a connection end part connected to the front end part 11a. The connection end part is formed of a first electrically conductive ceramic and constitutes a first resistor portion 11. The remaining portion of each of the large-diameter rodlike portions Ld is formed of a second electrically conductive ceramic having an electrical resistivity lower than that of the first electrically conductive ceramic and constitutes a second resistor portion 12. A joint interface 15 between the first resistor portion 1 and the second resistor portion 12 is located within the corresponding large-diameter rodlike portions Ld.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.