| 摘要 |
<p>Known devices of this type have orientable slats of translucid material with, on the inside, a plurality of conical prisms. With such an arrangement, the closure field obtained is more or less circular and, as a consequence, the daylight penetration is unfavorable while it is necessary to provide for an additional orientation during the day. The device according to the invention has, compared to known devices, better transparence characteristics to daylight without requiring to adjust the orientation during the day and with little adjustement throughout the year. To this effect, the slats (1) orientable along their horizontal axes (L) are of a simple construction, and are provided on their inner surfaces with prismatic bars (10) parallel to the longitudinal axes (L) and having on the outer surface a flat base face (11). The surfaces on the sides of the right angle of the prismatic bar (12, 13) are free of reflecting layers and form an angle of 90o.</p> |
