OPTICAL DUCT SYSTEM

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PROBLEM TO BE SOLVED : To provide an optical duct system having a cool-illumination effect in summer and allowing reduced power consumption of an air conditioner since a reflecting material used in an optical duct system can effectively convert natural light introduced from the outside into indoor illuminating light and can guide only visible light required for lighting. SOLUTION : The optical duct system including a light introducing portion 2, a light guide portion 4 and a light emitting portion 5, has a structure where at least two or more resins are alternately laminated to form 30 or more layers. In the optical duct system, a reflecting material satisfying a relation (1) and a relation (2) is used for the light guide portion 4. The relation (1) : Rave[400 nm≤λ≤700 nm]≥80%. The relation (2) : Rave[1, 500 nm≤λ≤2, 600 nm]≤30%. (Rave[a≤λ≤b] denotes an average reflectance(%) in a wavelength section of a≤λ≤b). COPYRIGHT : (C)2011, JPO&INPIT