| 摘要 |
PURPOSE:To reproduce a multi-value picture at a high speed by connecting the number of shift registers inputting/outputting in parallel a data for bit number's share in response to the gradation number by the corresponding number to dot forming elements so as to transfer data in response to the gradation number in parallel. CONSTITUTION:When a data outputted from a serial output terminal QD' of the shift registers 104-1-104-5 is logical 1, an output of corresponding LED drivers 103-1-103-5 is zero and the output terminal is connected to common, then the corresponding LED101-1 101-5 are lighted. On the other hand, when no data is outputted from the terminal QD', the corresponding LED101-1-101-5 remain extinguished. Thus, the LED101-1 generates optical energy by the time corresponding to 3/4 of the maximum lighting time, the LED101-2 generates optical energy over the maximum lighting time and the LED101-3 is not lighted at all and generates no optical energy. Thus, a picture having a density corresponding to the input picture signal is reproduced on a recording paper sheet.
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