| 摘要 |
<p>PROBLEM TO BE SOLVED: To surely electrically connect the exposed surface of a take-out lead wire made of W (tungsten) to an external connecting wire without generating oxidizing corrosion by a method wherein on each exposed surface of the take- out lead wire made of W, which is exposed on the surface of a ceramic base body, one end of the external connecting wire is soldered using a high purity silver solder. SOLUTION: Take-out lead wires 33, 34 are W wires, of which the diameter is 0.3mm, and one side ends 331, 341 are connected to the end parts 321, 322 of a heating resistor 32, and the other ends 332, 342 are exposed to the surface of the ceramic at an intermediate and rear parts of a ceramic base body 31. The one end 332 of the take-out lead wire 33, is electrically connected to a coil-form lead coil (external connecting wire) 51 (pure Ni wire) by a pure silver solder, and is electrically connected to a cylindrical major fitting 2 through a metal external cylinder 1. Also, the other end 342 of the take-out lead wire 34 is electrically connected to coil-form lead coils (heat resistant Ni alloy wires) 52, 53, which are external connecting wires, by a 85% silver solder, and also, is electrically connected to a terminal electrode 4.</p> |
