| 摘要 |
PURPOSE:To read and record correctly even a the time of the variable power by being provided with a frequency dividing circuit to divide a pulse at the dividing ratio in reverse proportion to the ratio of the shifting speed, and obtaining the timing signal of a reading action or a recording action by the dividing pulse of the frequency dividing circuit. CONSTITUTION:A variable power processing in the main scanning direction is executed by making a scanning speed V1 of the printer into constant and changing the scanning speed the reader to V1/n (n is a variable power ratio.). This shows tha the upper limit of the driving frequency of the ink jet head, an image forming means of the printer is lower than the upper limit value of the driving frequency of CCD. Therefore, at the time of unmagnification copying, to speed up a copying speed, the maximum ink jet driving frequency is used at the time of unmagnification. At such a time, a variable power mode is sent from an image controller 24 through a line 49 to a video data synchronizing signal generating circuit 28, and at the time of unmagnification and variable power a video line enable signal goes to be the same frequency and like that, the dividing ratio of the motor encoder pulse of the reader is set.
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