Patent ID: 7806160

Claim:
A blind for adjusting height and brightness made of thick material comprising: a blind sheet ( 7 ) including an inner blind material ( 7 a ) and an outer blind material ( 7 b ); an upper supporting bar ( 2 ); a winding rod ( 4 ) on which the blind sheet ( 7 ) is wound; a pre-weight element ( 10 ) secured on a loop part formed between the inner blind material ( 7 a ) and the outer blind material ( 7 b ) to stretch the blind sheet ( 7 ) with tension; and a rotation piece ( 11 ) having a first end coupled with the upper supporting bar ( 2 ) to rotate by a rotation element ( 12 ) and a second end in contact with the inner blind material ( 7 a ) wound on the winding rod ( 4 ); wherein an end of the inner blind material ( 7 a ) is fixed on the winding rod ( 4 ) and an end of the outer blind material ( 7 b ) is fixed on an external surface of the rotation piece ( 11 ).