| 摘要 |
PURPOSE:To copy information immediately from the last frame, by adding the last frame marks in a line in addition to lines of frame marks and the first frame marks. CONSTITUTION:On a microfilm 11, frame marks MK for individual frames K, the first frame marks MC for the first frames of respective frame groups KG, and the last frame marks MD for the last frames of respective frame groups are added in different lines in the longitudinal direction of the mirofilm. In case that an information group (B1, B2, and B3) of one unit is copied, the last frame mark MD of the frame group KG is detected by a reader/printer, and the copy is started immediately from the last frame K after information B3 of the last frame is recorded, and information B3, B2, and B1 are copied in order. In the microfilm where the last frame marks are not added, time is wasted and the operativity is low because the microfilm must be returned by an extent corresponding to one frame after detection of the start frame mark of the next frame group. |
