| 摘要 |
<p>A glow plug exhibiting excellent durability, being capable of preventing short circuit potentially caused by adhesion of carbon, and being capable of detecting ion current accurately, is disclosed, as well as a method for manufacturing the same. <??>The glow plug includes a metallic sleeve 1; a cylindrical metallic shell 2, which holds the metallic sleeve 1; a terminal electrode 3, which is attached into the cylindrical metallic shell 2 while being insulated therefrom; a ceramic heating member 4, which is fitted into the metallic sleeve 1; and a glass coating layer 5. In the glow plug, a portion of an ion detection electrode 411 is exposed at the surface of an insulator 44 of the ceramic heating member 4. The exposed portion is coated with a glass coating layer 5, which is formed in such a manner as to extend all around the insulator 44 of the ceramic heating member 4 and has a thickness of 10-200 mu m and a softening point of not lower than 700 DEG C. <IMAGE> <IMAGE></p> |
