| 摘要 |
PURPOSE: To provide a sunlight natural-illumination device with ultraviolet ray and infrared ray cut in sunlight beam at the stage of a cover for natural illumination. CONSTITUTION: A sunlight natural-illumination device has natural-illumination prisms 1a, 1b arranged in a natural-illumination area, a driver 2 for the natural- illumination prisms 1a, 1b and a controller to control the driver 2 so that the natural-illumination prisms 1a, 1b can be set at a proper rotating angle corresponding to the position of the sun. A dome cover 3A to cover the natural- illumination prisms 1a, 1b is made up with a base layer formed by adding an ultraviolet absorbent into raw material, acrylic resin or polycarbonate. In this case, there may be an alternative of making up the dome cover with the base layer of acrylic resin or polycarbonate and an infrared reflecting layer combined or making up the base layer combined with the infrared reflecting layer by adding the ultraviolet absorbent into acrylic resin or polycarbonate. |
