ROLL BLIND

摘要

PROBLEM TO BE SOLVED: To provide a roll blind which prevents light leakage from upper and lower edges of opaque portions by displacing front and rear translucent portions of a double screen from each other in a manner completely avoiding superposition of the former and the latter on each other. SOLUTION: According to the arrangement of the roll blind, a pair of support brackets 14 are arranged at both ends of an upper end support bar 13 mounted on a wall surface 11, and both ends of a winding rod 16 extending along the support bar are pivoted on the support brackets, respectively. Then a screen 17 formed of the translucent portions 17b and the opaque portions 17c alternately continuously arranged in a winding direction, has one end thereof fixed to the upper end support bar 13, the other end thereof wound on the winding rod in an unwindable manner, and a lower edge thereof folded back, to thereby form a double screen structure. Then a weight main body 18 for applying a tension to the screen is mounted on the screen so as to be always located at a fold-back portion 17a of the screen. Herein when the length of the translucent portion in the screen winding direction is represented by L1, the length L2of the opaque portion in the screen winding direction is set to the range of 1.2L1to 1.8L1. COPYRIGHT: (C)2009,JPO&INPIT