| 摘要 |
A method of uniformly applying a phosphor onto the internal surface of a glass tube of spiral configuration having opening at its both ends. After an injection process is performed while glass tube (11) is held with openings (24,25) facing upward, the glass tube is turned upside down and held such that the openings are positioned in the inferior region. While rotating the glass tube around pivot axis (A), the phosphor suspension is caused to flow out. The glass tube is turned upside down once more and held to cause the openings to position in the superior region for a given period of time with the result that the phosphor suspension is caused to flow to uniformize the thickness thereof. Further once more the glass tube is turned upside down to cause the openings to position in the inferior region. In that state, a preliminary drying process is performed.
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