| 摘要 |
PURPOSE:To obtain a fluorescent lamp with reduced electrode loss good efficiency, smaller flux deterioration and longer duration of life by applying an insulating material on at least inner part from the filament of a supporting line for supporting an electrode filament. CONSTITUTION:An insulating material 13 such as an inorganic adhesive is applied on the tube inner part of a supporting line 11 for supporting a filament 6a constituting an electrode. With this constitution, the tube inner end part of the filament 6a as shown by a point A becomes a positive electrode in a positive electrode cycle, and a discharge current flows through the filament 6a as shown in the figure by a dot line B. Accordingly, it is possible to prevent any drop of hot spot temperature in the positive electrode cycle, allowing lamp efficiency to be finally improved. |
