FILM MATERIAL FOR LUMINOUS CEILING SUPERIOR IN INSECT SHADOW TRACE PREVENTION, AND LUMINOUS CEILING SYSTEM USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a film material for a luminous ceiling, which has flexibility, high strength, high visible light transmission and moderate light diffusibility and which reduces or prevents a foreign-matter shadow cast by the dead body of a phototactic insect; and to provide a luminous ceiling system using the film material.;SOLUTION: In this film material for the luminous ceiling, an insect dead-body decomposition layer containing a visible light response-type photocatalytic substance is provided on at least one of the flexible resin layers, in an optically diffusible and transparent sheet with a visible light transmission (JIS-Z8722) of 30-70%, which contains a composite base material constituted by superposing the flexible resin layer on one side or more of a textile fabric containing a stretched filament. The absolute value of a difference between a refractive index n1 of a flexible resin and a drawing-direction refractive index na of the stretched filament is expressed by the inequality: 0.02|n1-na|≤0.07; and the absolute value of a difference between the refractive index n1 of the flexible resin layer and a refractive index nb in a drawing vertical direction b is expressed by the inequality: |n1-nb|≤0.07. In the luminous ceiling system, at least the insect dead-body decomposition layer of the film material for the luminous ceiling is arranged in the state of facing a fluorescent lamp.;COPYRIGHT: (C)2011,JPO&INPIT