| 摘要 |
PURPOSE:To avoid the waste of a film which occurs during handling process of a photographi target by automatically opening and closing the screen plate of the photographic target, in response to the movement of the photographic target so that the screen plate of the photographic target can open at the electron beam exposure position and close ar the other positions. CONSTITUTION:A photographic target 9 charged with a roll film 8 is loaded outside the electron beam passage hole 16 in a camera room 1 while a screen plate 4 is in closed condition. The photographic target 9 ia shifted toward the electron beam passage hole 16 through a fixed bench 10 by moving the shaft 11 of an air cylinder 13 and the screen plate 4 is opened by a fixing pin 5. Then by returning an air cylinder 13 after the end of photographing the screen plate 4 is forced to hit the side wall of the camera room 1 to be automatically closed. As a result the screen plate 4 closes to prevent the first or last single comes of the film 8 from being exposed to light, when the photographic target 9 is inserted or removed, thus enabling effective use of the film without any waste. |
