| 摘要 |
PURPOSE:To keep the aspect ratio of each reading picture element at a fixed value even if reading magnification is changed by using an optical system capable of varying power steplessly and varying the moving speed of a film in accordance with the magnification. CONSTITUTION:The moving speed of a moving means is variably controlled in accordance with projecting magnification. For instance, pulse magnification km for step feeding is outputted from a scanner control circuit 17 and a load pulse Lpkm is outputted from the circuit 17 within a period that the pulse magnification km is effective and the magnification km is loaded to a register 41. Then, an objective line address (n) is outputted from the circuit 17 and a starting signal ss is outputted during a period the address (n) is effective.
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