| abstract |
(57) Abstract: A rare gas discharge lamp having a structure in which at least two or more outer electrodes are provided on an outer surface of a glass bulb for causing a dielectric barrier discharge via the glass bulb, It is possible to obtain a larger amount of light while making the tube diameter of the glass bulb smaller than before. In addition, light can be extracted in all directions. The outer electrodes (23C, 23D) of a glass bulb (3) are provided. Is composed of transparent electrodes, so that light is radiated in the entire circumferential direction of the discharge lamp. Each of the transparent outer electrodes 23C and 23D has a width in the tube axis direction of the glass bulb 3 and surrounds the outer surface of the glass bulb along the outer periphery of the bulb, and is spaced apart from each other by a predetermined distance in the tube axis direction of the glass bulb. Are provided at intervals. Since the distance d between the outer electrodes 23C and 23D can be determined irrespective of the diameter of the glass bulb 3, the distance required for insulation between the transparent electrodes 23C and 23D can be reduced even when the glass bulb 3 becomes thin. Can be secured. |