| 摘要 |
PURPOSE:To suppress deviation in main scanning synchronism by discriminating on the generation timing of a transfer start signal with a reference window signal. CONSTITUTION:A CR timer 17 is triggered with a signal SS to generate a signal SW. A waveform shaping circuit 18 compares the signal SW with reference signals Vr1 and Vr2 and outputs the reference window signal WP with a logical level ''H'' when Vr1>SW>Vr2. Consequently, the signal WP is held at the logical level ''H'' only for prescribed time width a specific time after the signal SS is outputted. A timing discriminating circuit 19 discriminates that the counting operation of a counter 13 is normal when a signal STd is outputted from the counter 13 during said ''H'' period and regards the signal STd as a data transfer command signal TS; and the circuit 19 discriminates that the counting operation is abnormal unless the signal STd is outputted and generates and applies a pulse signal synchronizing with the trailing edge of the signal WP to a storage control part 14 as the signal TS. Thus, deviation in the start timing of the recording data transfer of a control part 14 is suppressed. |
