| 摘要 |
PROBLEM TO BE SOLVED: To provide an external electrode type fluorescent lamp having an electrode outside both the ends of a glass tube, which causes less damage to the glass tube at the electrode portion even if the lamp is lighted for a long time, is difficult to generate the boring on the glass tube even if the input electric power is increased to increase the light quantity, and has a good quality of long life. SOLUTION: An external electrode 2 is provided outside an end of the glass tube 1 having therein a fluorescent layer and a filler gas, and an insulating layer 3 is provided at a predetermined width at least at a portion corresponding to a tip end at the discharge space side of the external electrode 2 on an inner face of the end of the glass tube 1. The insulating layer 3 is formed as an insulating film made of an insulating material such as an oxide, a frit glass, ceramics or the like, and is provided at a distance within 20mm from a tip of the external electrode 2 toward the discharge space side . The external electrode 2 can be formed from ITO and the like in addition to a conductive adhesive, and can also be formed as a metal film by the vapor deposition method or ion plating method, and may cover even an end of the glass tube 1. COPYRIGHT: (C)2004,JPO
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