Yazaki Corporation

Masataka Shishido

Takashi Sato

Tetsuya Mitani

Hiromitsu Tsuchiya

Takahisa Suzuki

The discharge tube consists of an electrically insulating cylindrical body and a pair of electrodes disposed facing each other in the cylindrical body, and is sealed with an inert gas. An activation layer of a silicate compound of alkaline metal is formed over at least a part of the inner wall surface and the electrode surface, other than the discharge surface, that are exposed to the sealed gas. This activation layer helps keep the discharge inception voltage stable even when the discharge frequency changes greatly, which in turn extends the longevity of the discharge tube.

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Shizuoka, Japan

Masataka Shishido