| 摘要 |
PROBLEM TO BE SOLVED: To provide a discharge tube having a long life, wherein an initial discharge starting voltage is prevented from rising, and no initial discharge delay is caused. SOLUTION: Opening parts at both ends of a case member 12 is airtightly sealed by a pair of lid members 14, 14 also serving as discharge electrodes to form an airtight envelope 16, a discharge gas is filled in the airtight envelope 16, and a discharge gap 22 is formed between the discharge electrode parts 18, 18 of the lid members 14, 14. A plurality of trigger discharge films 28 both ends of which are disposed with a minute discharge gap 26 parted from the lid members 14, 14 are formed on the inner wall face 24 of the case member 12, and in addition, a coat 30 containing a mixture of cesium bromide and titanium is formed on the surface of the discharge electrode part 18. COPYRIGHT: (C)2006,JPO&NCIPI
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