| 摘要 |
PURPOSE: A venetian blind is provided to penetrate the t effectively at the opening position and to shade the light effectively at the closing position. CONSTITUTION: A venetian blind comprises a surface layer(100) and a back layer(200) located parallel to each other, and a dark curtain layer(300) connecting the surface layer and the back layer successively and repeatedly. The dark curtain layer is parallel to the surface layer and the back layer to cut off the light effectively at the closing position of a blind, and to transfer the light effectively to the space between the surface layer and the back layer at the opening position of a blind. |
