| 摘要 |
PURPOSE:To improve the light distribution in the tip direction of a bulb by providing a barrier wall between a pair of electrodes encapsulated at the bottom of the bulb while providing a pluraity of discharge regulating boards having the discharge guide section on both faces of the barrier wall. CONSTITUTION:A stem 4 fixed with a pair of electrodes 5 is encapsulated at the bottom 2 of a glass bulb 1 where a phosphor subsistance layer 3 is applied on the inner face, then a barrier wall 8 having the side end 10 contacting with the inner wall face of the bulb 1 and the tip 11 is separated by predetermined distance from the tip 12 of the bulb 1 is provided to partition the electrode 5, then a plurality of discharge regulating boards 13 formed with a discharge guide section 14 is secured to both faces of the barrier wall 8 to form a single base type discharge lamp. Consequently the length of the discharge path 18 can be made sufficiently long while the discharge path 18 including the bulb tip 12 direction can be brought near to the inner wall direction of the bulb 1 resulting in the improvement of the light distribution and the light output. |
