| 摘要 |
<p>The aim of the invention for obliquely positioning a projection screen (1) which can be rolled up and can rotate about a vertical axis is to avoid image distortions on the protection screen when a projector is set up near the projection screen, for example at lectern height. An arm (7) projects rearwards at the upper end of the projection screen (1). A draw wire (9) connected to the arm (7) is suspended in a slider (15), which can be displaced on the lower stressing bar (4), and is fastened to the lower strip (14) of the projection screen (1). <IMAGE></p> |
