Influence of Mercury on the Characteristics of Hot Cathode Lamps and Cold Cathode Lamps

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  • 水銀の有無が熱陰極放電灯と冷陰極放電灯に及ぼす影響に関する研究
  • スイギン ノ ウム ガ ネツ インキョク ホウデントウ ト レイ インキョク ホウデントウ ニ オヨボス エイキョウ ニ カンスル ケンキュウ

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Discharge lamps that have electrodes are classified into two categories, hot cathode lamps (HCLs) and cold cathode lamps (CCLs). We investigated the relationship between the presence of Hg, the kinds of rare gases present, and the cathode fall voltage (CFV) of both CCLs and HCLs. The results show mainly two points. One is the difference in the CFV characteristics, that is, CCLs’ CFV is positive, while HCLs’ is negative. This is because the emission mechanism of CCLs, due to the gamma effect, differs from that of HCLs due to the Schottky effect. The other main point is the influence of Hg on the CFV. The CFV of CCLs increases when Hg is present because of the difference between γ-coefficients for Ne+ and Hg2+ due to the energy potentials. The CFV of HCL also increases when Hg is present because of the difference between the cathode temperatures in an Ar discharge and an Ar-Hg discharge.

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