| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lighting apparatus which does not impair workability of a person who does a work such as reading and yet does not prevent from entering a smooth sleeping. <P>SOLUTION: The lighting apparatus 1 includes a light source 2, a cylindrical case 4 which has an irradiation face 3 to face a floor F, and a louver 6. The louver 6 has a plurality of annular flaps 5 with different diameters arranged on a concentric circle, and each flap 5 is fixed on the irradiation face 3 so that its normal line direction r1 may be nearly in parallel with the floor face F. Each flap 5 is constructed into a filter to reduce transmission of light of a wavelength component which has an action to suppress secretion of melatonin to a human body out of the light from the light source 2. The light going directly downward from the light source 2 does not pass the flap 5 and becomes direct light L1, and the color rendering property of the light of the light source 2 is maintained, thereby workability of a user P1 is not impaired. The light going in an inclined direction of a prescribed angle θ becomes light L2 which transmits the flap 5 and the light of a wavelength component which suppresses secretion of melatonin is reduced, thereby smooth entering into sleep of a user P2 is not prevented. <P>COPYRIGHT: (C)2009,JPO&INPIT |
