| 摘要 |
The invention provides a surge absorber coated with an oxide layer that has excellent chemical stability at the high temperature range and excellent adhesive forces with respect to main discharge electrodes. The surge absorber includes a column-shaped ceramic member 4 that has a conductive film 3 divided by a discharge gap 2 interposed therebetween; a pair of main discharge electrode members 5 opposite to each other on both ends of the column-shaped ceramic member 4 to come in contact with the conductive film 3; and a cylindrical ceramic tube 7 which is fitted to the pair of main discharge electrode members 5 opposite to each other to seal both the column-shaped ceramic member 4 and sealing gas inside thereof. Oxide films 9B are formed on main discharge surfaces 9A of at least the protrusive supporting portions 9 of the pair of main discharge electrode members 5 opposite to each other, by performing an oxidation treatment, respectively. |
