| 摘要 |
PURPOSE:To prevent flickering of lamp even when any electrode goes positive electrode phase by exactly generating a positive electrode oscillation. CONSTITUTION:The stem 2 is provided at the end of the valve 1 and the filament coil 4 is connected to the supporting wire 3 extending in the axial direction of the bulb 1 in such a way that it is at almost right angle to the axial direction of bulb 1. For the filament coil 4, the pitch is set up to 0.6-1.1mm., the length of a portion extending from the supporting wire 3 of the filament coil 4 to the wall side of the bulb 1 is set up to 1.0mm. or less, and also the shortest distance between the supporting wire 3 and the wall surface of the bulb 1 is set up to 3-7mm.. |
