| 摘要 |
FIELD: physics.SUBSTANCE: foldable projection screen relates to portable projection screens and includes a solid-state composite plane coated with a light-reflecting film, mounted on a support. The screen is formed from four equiareal pivotally connected upper plates A, B and lower plates C, D, which can be folded with each other: A with B and C with D with front faces of the plates opposite each other, and then A with C with rear sides of the plates, for which there is no pivot between one pair of plates B and D.EFFECT: compactness and easier transportation of the screen and the projector in a single case.3 cl, 2 dwg |
