| 摘要 |
A variable-amplitude projection screen comprises a screen curtain (5), a scroll (7), a frame (1, 2), brackets (6) and magnetic strips (8). A frame (1, 2) is formed by two fixed-length rims (1) and two telescopic rims (2) which are fixedly connected in turn in an alternating and symmetrical way. The brackets (6) are fixedly connected at the back surface of the frame (1, 2) and two ends of the fixed-length rims (1) respectively. The scroll (7) is arranged and fixedly connected between the brackets (6) which are arranged at two ends of the fixed-length rims (1). The screen curtain (5) is arranged between the frame (1, 2) and the scroll (7). Two sides of the screen curtain (5) are fixedly connected with the scroll (7) which is fixedly connected on the fixed-length rims (1) respectively. Two sets of magnetic strips (8) are arranged and fixedly connected between the telescopic rims (2) of the frame (1, 2) and the screen curtain (5) respectively. When watching a video file which has different amplitude from that of the used projection screen, the amplitude of video file is adjusted to be consistent with the size of the fixed-length rims (1) firstly and then the amplitude size thereof in the other direction is adjusted via the telescopic rims (2). |
