| 摘要 |
PURPOSE: An advertisement board comprising a roll film is provided to prevent operation error and damage of a film. CONSTITUTION: A display part displays visual elements comprising more than one of symbol, character and figure. The display part comprises a roll film (10) connecting page display units of an exposed region continuous at a time. The roll film is combined to a sensor recognizing part at each unit. A frame (20) includes a display window (25), a rotary axis part, an electrically driven motor, a sensor and a control unit. The display window supports the display part, and has the size capable of exposing a page of one unit of the roll film. The rotary axis part is connected to the roll film, and is able to wind or unwind the roll film, and is installed in a frame as being able to rotate. The electrically driven motor is connected to the rotary axis part via a dynamic power delivery unit, and is installed in the frame to give rotary force. The sensor is installed at different position of the frame in order to sense the sense recognition part combined to the roll film. The control unit controls the winding operation of the roll film.
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