低圧放電の高周波点灯に於ける希ガスの陰極降下電圧に及ぼす影響

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概要

• 論文の詳細を見る

• The dependence of the cathode fall voltage (CFV) of hot-cathode low-pressure discharge, which depends on the cathode temperature, on the rare gases was measured for an operation frequency of 50kHz. The gases tested were Ne-Hg and Ar-Hg. The results showed that the CFV oscillated in Ar-Hg discharge, but not in Ne-Hg discharge. This difference can be explained by the behavior of the ions, produced by the collisions between the atoms and primary electrons emitted from the cathode. The primary electrons with sufficiently high energy to ionize the atoms change to Maxwellian electrons after the ionization. The ions thus produced diffuse to the cathode, which cause an ion current. The discharge current consists of the ion current and an electron current. If the ion current increases for some discharges, the electron current should decrease. This means the CFV decreases with an increasing ion current, because it decreases with a decreasing electron current (the Schottky Effect). The time for the ions to reach the cathode in Ar-Hg discharge was calculated to be shorter than in Ne-Hg discharge. This calculation also showed that the time for Ar-Hg discharge is nearly equal to the period of the CFV oscillation and that the time for Ne-Hg discharge is nearly equal to the time lag of the peak of the current to the peak of the CFV. Thus, the CFV under high-frequency operation depends on which rare gas is used because rare gas affects the ion current, which in turn affects the CFV.

• 社団法人照明学会の論文
• 1999-11-01

著者

• 野田 渉

  松下電工株式会社

• 田口 典幸

  松下電工

• 植月 唯夫

  松下電工株式会社

• 田口 典幸

  松下電工株式会社

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