| 摘要 |
A switch 1 includes a ceramic cylindrical tube 3 , first and second end caps 5 and 7 that cover the open end in an axial direction of the ceramic cylindrical tube 3 , a movable electrode 9 which slides easily on first end cap 5 and a fixed electrode 11 attached to second end cap 7 . The ceramic cylindrical tube 3 is a ceramic fired body that contains 45 to 65% by weight of alumina and 35 to 55% by weight of crystallized glass. First and second end caps 5 and 7 are attached to both ends in the axial direction of the ceramic cylindrical tube 3 . A low temperature metallizing layer is formed on the ends thereof, and a plating layer is formed on top of the metallizing layer where first and second end caps 5 and 7 are brazed.
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