| 摘要 |
PURPOSE:To keep the position of scanning start at the same position, even for different-sized microfilms, by changing the position of an aperture card supporting plate. CONSTITUTION:When a switch corresponding to the size of a microfilm, a step motor 26 revolves and selects a stop pin 32 which restricts a start point through contact with the end of an aperture card supporting plate 21 so that the length of the pin 32 is suitable. The plate 21 moves toward at a direction (d) along a rail 22 and a microfilm 36 loaded to an aperture card 34 is scanned and exposed. In this case, the scanning start position can be kept at a constant position independently of the size of the microfilm 36. |
