| 摘要 |
PROBLEM TO BE SOLVED: To provide a projection screen which is foldable to a small volume and can be easily carried in the form of stowage into a bag, etc., by constituting the projection screen of a projection film consisting of a freely foldable and soft material and an air bag consisting of an air-impermeable and soft material. SOLUTION: The air bag 2 is formed by superposing two sheets of hot meltable soft resin films and fusing these films and is constituted of a thick pipe-like peripheral picture frame part 2a and fine pipe-like vertical array parts 2b in a transverse direction so as to fill the inner side of the picture frame part 2a when it is inflated to a plate form having a thickness over the entire part like an air mat when two sheets are superposed and welded and air is blown therein. The air bag 2 is provided with a plurality of air inlet and outlet ports with check valves at its important points. The air bag 2 is inflated by blowing air with the mouth from these air inlet and outlet ports or using a foot air pump, etc. The projection film 1 is made of the freely foldable and soft resin sheet material or cloth material and its four side parts or two upper and lower side parts are fixed by welding or adhering to the portions to constitute the peripheral picture frame part 2a in the inflated state of the air bag 2. |
