| 摘要 |
PROBLEM TO BE SOLVED: To easily confirm visibly an operation state of equipment arranged in an upstream of an air filter medium, from a downstream, without moving it the upstream. SOLUTION: The air filter medium 1 formed of an inorganic or organic fibrous material is constituted to be woven with a material 2 having a display function, on a filter medium surface. A transparent fibrous acryl polymer or polyproplylene, or a glass short fiber is used as the material 2 having the display function. A light emitting state by a light source arranged in an upstream of the air filter medium 1 is confirmed visibly from the downstream, by this constitution. COPYRIGHT: (C)2009,JPO&INPIT
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