| 摘要 |
PROBLEM TO BE SOLVED: To provide a screen which can be finely wound up without creases. SOLUTION: Flexible protrusive streaks 6 guided by guide rails are provided at both side edges of a membrane body 5 wound up by a winding shaft 1. A thick part 9 is formed in the breadthwise middle part of the membrane body 5 and the thickness of the thick part 9 is made thicker than the thickness of the protrusive streak 6 to prevent generation of creases on winding up the membrane body 5.
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