| 摘要 |
PROBLEM TO BE SOLVED: To provide a speaker diaphragm that makes the difference between when it is on off conspicuous, and has excellent luminescence properties. SOLUTION: The speaker diaphragm comprises: a substrate; a surface material arranged at the radiation side of the substrate; and a luminous layer that is provided on the radiation surface of the surface material and contains a fluorescent pigment, where the average grain size is not more than 1μm. COPYRIGHT: (C)2008,JPO&INPIT
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