Patent ID: 7069973

Claim:
A blind in which a plurality of slats are supported in alignment by a ladder cord suspended from a head box, a top end of the ladder cord is supported by a ladder cord support device provided in the head box, the ladder cord support device is operated to rotate the slats, one end of a lift cord is connected to a bottom rail, to which a bottom end of the ladder cord is connected, while the other end of the lift cord is passed through the slats and introduced into the head box, and said lift cord is raised or lowered to raise or lower the slats and the bottom rail, wherein at least one of said slats has a curved section in a slat width direction and comprises: a lift cord passing hole through which said lift cord passes, a length of said lift cord passing hole in the slat width direction is b, a slat width is a, and a slat crown height is e, wherein the slat crown height e≠0 and 0.59 · e a + 0.19 ≤ b a ≤ - 1.41 · e a + 0.70 is satisfied, and a protrusion, which crosses an extension line of the lift cord passing hole and protrudes beyond a general plane of the at least one slat, the extension line connecting an edge of the lift cord passing hole in the slat width direction and an edge of the at least one slat in the slat width direction.