JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN
Online ISSN : 1349-838X
Print ISSN : 0019-2341
ISSN-L : 0019-2341
Special Issue: Electrode for Fluorescent Lamp and the Technology Trend
Influence of Mercury on the Characteristics of Hot Cathode Lamps and Cold Cathode Lamps
Tadao UetsukiTakuma OhiraYuuji TakedaOsamu Fukumasa
Author information
JOURNALS FREE ACCESS

2008 Volume 92 Issue 11 Pages 775-782

Details
Abstract

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.

Information related to the author
© 2008 The Illuminating Engineering Institute of Japan
Previous article Next article
feedback
Top