| 摘要 |
<p>PURPOSE:To continuously change illuminance distribution in relation to an indoor space to decrease unpleasant glare by changing a position and shape of an opening part by means of an opening part shape control means, and based thereon controlling a light beam projection control means. CONSTITUTION:An unopened part is formed of unopened plates 16a, 16d and 16c, 16d, being in sets of two pieces. By shifting this set of unopened plates 16a-16d mutually outward, an interval in the opening part 17 can be changed. When a position and shape of the opening part 17 are controlled by an opening part shape control means, positions of mutually different sets of the unopened plates 16a, 16b... are changed to adjust width of the opening part 17. A light source 12 corresponding to the opening part 17 is lighted and the light source 12 corresponding to the unopened parts 16a-16d is not lighted. When a light projecting means is thus controlled by a dimming control means, ineffective light projection inside of the opening part 17 unopened parts can be changed and illuminance distribution can be continuously changed.</p> |
