Retractable Projection Screen and Device for Ensuring its Flatness

摘要

The invention relates to a projection screen consisting of a rollable fabric (22) comprising a projection surface (28), means for rolling the said fabric, ballasting means (24) helping with the unrolling of the said fabric and providing it by gravity with vertical tensioning, and means for guiding (25, 26) and for laterally tensioning (29) the said fabric that are secured to fixed lateral walls that are generally face to face and at right angles to the fabric.