| 摘要 |
PURPOSE:To improve operability, by constituting so that a microfilm is not moved even if a key (-1 case key) for returning an information frame group by 1 group is operated, when the microfilm is stopped at its head frame. CONSTITUTION:Between a start mark MS and an end mark ME of a micro- film 1, a lot of information frames K are provided at constant intervals, and in accordance with each information frame, a frame mark Mk is put, and in accordance with the head frame of information (consisting of plural frames) of 1 case portion, a case mark Mc is put. When the film stopped at an information frame P2 or P3, if a key (-1 case key) 23 for returning an information frame group by 1 group is operated, the microfilm 1 is moved in the return direction and is stopped at the head frame P1, but in case when said -1 case key 23 has been operated when the film is stopped at the head frame P1, the microfilm 1 is not moved. |
