| 摘要 |
The objective of the invention is an overhead projector (1) supplied with acetate film rolls (4), to which projector belongs a body (2) onto which is fixed a projection arm (16) equipped with a lens/lenses (21) and a flat mirror (20). The body (2) is supplied with an openable top part (3) into which roll spaces are arranged for the acetate film rolls (4). The acetate film rolls (4) are installed on axle rods (26) which are supplied with rotating cylinders (5) and mounted in the top part (3) at opposite ends in the shaped spaces with the aid of a bent spring and fixing hole. In the inner side of the body (2) is also arranged at least one shutter screen element (10-13) that stays inside the body (2) in all cases of use, and which is installed to cover the projected part of the acetate film (6) fully or partially. The screen elements are moved in a flat level on guiding rods (15) inside the body (2) in the directions of the length and/or width of the body (2) with the help of levers (14). |
