| 摘要 |
PURPOSE:To change the illumination light quantity and light distribution characteristic and obtain the variation of illumination by changing the size of light control plates, the interval with a light source, and the transmittance of the light control plates in an illumination apparatus constituted of the linear light source and the light control plates. CONSTITUTION:A part of the light from a fluorescent lamp 7 is reflected on inner faces of non-transmittible light control plates 18a, 18b and horizontally illuminated in the tube axis direction from gaps 20, 22, the remaining light is reflected on a ceiling face 2 and indirectly illuminated to an illuminated face together with the light from the gaps 20, 22. When the plates 18 are semi- transmittible, the light passes the gaps 20, 22 and is horizontally illuminated, and the remaining light is transmitted through the plates 18 and illuminated downward. When the width size of the plates 18 and the interval with the lamp 7 are changed, the light quantity in the horizontal direction can be changed. The light distribution characteristic and light quantity of an illumination apparatus are changed simply and freely, and the variation of illumination can be obtained by one illumination apparatus. |
