| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluorescent lamp having a wide light modulation region and allowing the brightnessΦ<SB>min</SB>of the lamp to be set to 0.5 % or below even in the case where the lowest duty ratio D<SB>min</SB>is 0.5%. SOLUTION: This fluorescent lamp has: a glass tube 2 having a phosphor coating 1 formed on the inside wall surface, and filled with a discharge medium containing xenon gas; an internal electrode 4 enclosed by leading out a lead wire 3 on one end side of the glass tube 2; a first external electrode 5a formed on the outer peripheral surface over nearly the total length in the tube axis direction of the glass tube 2; and a second external electrode 5b formed on the outer peripheral surface for forming the electrode 5a by interlaying an insulation layer 8a. The fluorescent lamp is characterized by that the electrode 5a and the electrode 5b are electrically independent of each other in a switchable manner, and having installation areas different from each other. COPYRIGHT: (C)2004,JPO
|
