| 摘要 |
PURPOSE:To prevent disconnection due to vibration and to improve heat conductivity by reversing the direction of working when manufacturing a titled heat generating tube by swaging the combined body. CONSTITUTION:A welded body 106 made by welding a heat generating coil to the tip of a center electrode rod is inserted concentrically into a metallic tube 102 having closed tip, and the bottom of the tube 102 and heat generating coil are connected. A combined body 110 is manufactured by filling insulating ceramic powder 107 in the tube 102 and attaching a stopper 108 made of elastic body at open end. This combined body is swaged and the tube 102 is drawn to specified outer diameter and glass sealed 121 to form a heat generating tube 100. Here, swaging is made from opening side instead of tip side of the tube 102. By this way, the powder 107 can be filled to high density in the tip side of the tube 102, retaining force of the coil 104 becomes sufficient, heat insulation due to vibration is prevented and heat conductivity is improved.
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