| 摘要 |
PROBLEM TO BE SOLVED: To provide an annular fluorescent lamp in which there is no peeling off or crack of a film, in which phosphor layers of the optimum adhesion amount are formed on both outside and inside, and in which deterioration due to heat in a bending process of a bulb is suppressed, and a manufacturing method of the annular fluorescent lamp. SOLUTION: This is equipped with a translucent bulb which is formed in annular shape, in which a discharge medium is sealed, and in which an electrode means are sealed and mounded on both ends, and a phosphor layer formed in the inner face side of the translucent bulb so that a difference between a site of the largest adhesion amount and the site of the smallest adhesion amount per unit area becomes less than 8%. By this constitution, the adhesion amount of the phosphor layers of the inside and the outside can be set respectively to the optimum against the ring center. COPYRIGHT: (C)2008,JPO&INPIT
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