Cinema screen masking device, has control unit controlling stiffener position in plane parallel to screen plane and in direction perpendicular to cloth unrolling direction, to adjust masking surface of left, right and bottom masks

摘要

The device has top, left, right and bottom masks (5,18,19,6), each including a cloth rolled around a rolling axle, and a stiffener holding a free edge of the cloth and longer than the cloth. A control unit controls the stiffener position in a plane parallel to that of a screen and in a direction perpendicular to cloth unrolling direction, to roll the cloth towards the screen center to adjust a masking surface of each mask.