Ceramic heater for oxygen sensor of the type having oxygen ion conductive tube of solid electrolyte
US5451748A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1994 |
| Grant date | Sep 19, 1995 |
| Priority date | — |
| Expiry date | Jul 22, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4067
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In an oxygen sensor of the type having an oxygen ion conductive tube of solid electrolyte, a ceramic heater disposed within the oxygen ion conductive tube for heating the same is in the form of a quadrangular prism or a bar of a rectangular cross section. The ceramic heater is formed by piling up ceramic green sheets with metallic thick-film patterns for heat generating resistors interposed between adjacent two of the ceramic green sheets. The ceramic heater is so shaped as to satisfy the relation of b/a=0.75.about.1 where "a" is the width and "b" is the thickness of the ceramic heater. The metallic thick films, which the metallic thick-film patterns are turned to by firing, are arranged so as to be parallel to the side surfaces opposed in the thickness direction of the ceramic heater.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.