| 简介 |
PROBLEM TO BE SOLVED : To provide a fluorescent lamp which can be manufactured in an inexpensive manner in view of the cost and which enables the reduction in color difference at tube ends.
SOLUTION : A fluorescent lamp comprises : a glass tube; electrodes at opposing ends of the glass tube; and a phosphor layer provided on an inner face of the glass tube. The phosphor layer includes a phosphor layer making the first layer on the side of the glass tube, and a phosphor layer making the second layer on the side of a discharge space. As the first layer composed of the phosphor layer, a phosphor layer including a calcium halophosphate phosphor as a primary component is provided. As the second layer composed of the phosphor layer, a phosphor layer including a rare earth-activated phosphor as a primary component is provided. The viscosity of a fluorescence coating material used in producing the second layer composed of the phosphor layer is 110 mPas or larger.
SELECTED DRAWING : Figure 2
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