Patent ID: 8646509

Claim:
A blind with a looped blind sheet for adjusting opacity comprising: a top rod supporter; a top rod whose left and right ends connected to the top rod supporter; a bottom rod supporter; a bottom rod whose left and right ends connected to the bottom rod supporter; and a looped blind sheet with predetermined length and width having see-through parts and opaque parts arranged in an alternate manner and connected to form a loop; the loop wound between the top rod and the bottom rod to form a front blind sheet and a rear blind sheet that are opposed to each other and are stretched tightly by weight of both the bottom rod and the bottom rod supporter; wherein overlap degree of the see-through parts and the opaque parts between the front blind sheet and the rear blind sheet is changed by synchronous relative movement of the front blind sheet and the rear blind sheet when the front blind sheet or the rear blind sheet is pulled down or up so as to adjust opacity of the blind without changing length of the front blind sheet and length of the rear blind sheet, and wherein a small loop with certain length is formed on a bight of the looped blind sheet around the top rod or the bottom rod; the small loop including a front termination and a rear termination while the top rod or the bottom rod passes through in the small loop so as to limit relative movement of the front and the rear blind sheets being pulled for adjusting opacity.