| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a structure that enables stable optical output without deterioration in a phosphor layer in a fluorescent lamp which includes: an arc tube made of quartz glass filled with a discharge gas containing xenon; a pair of electrodes formed in the longitudinal direction of the arc tube and facing each other across a dielectric; an inner phosphor layer formed on an inner surface of the arc tube; and an aperture portion where the inner phosphor layer is not formed at a part in the circumferential direction of the arc tube. <P>SOLUTION: An outer tube is provided so as to cover the arc tube. An outer phosphor layer is formed on an outer surface corresponding to the aperture portion in the luminous tube. <P>COPYRIGHT: (C)2012,JPO&INPIT |
