| 摘要 |
<p>PURPOSE:To simplify manufacture and to improve reliability by covering a hollow part with a composite of which the outer layer is formed of glass of a softening point 800 deg.C or above and the inner layer of glass and ceramics, and by burying a coiled metal wire in the inner wall of the hollow part. CONSTITUTION:A sensor 1 is made to be a heating resistor by making a current flow through a coiled platinum wire 2. This wire 2 is wound round in the shape of a coil virtually around the center line in the axial direction of a hollow part 6, and lead wires 3 of a platinum-iridium alloy are connected to the opposite ends of said wire by connecting parts 21 respectively. The hollow part 6 is sealed hermetically with a glass member 5 of a softening point 800 deg.C or above as an outer layer and with a composite member 4 of glass and alumina as an inner layer, and the lead wires 3 are supported by the members 4 and 5. By constructing the sensor in this way, the manufacture can be simplified and the reliability can be improved.</p> |
