| 摘要 |
PURPOSE:To reduce the variation in the amounts of bias and strain due to ink temperature, ink pressure, etc. in the titled device of electric charge bias type by changing the amount of strain correction of bias drops in accordance with the output signal to detect the flying speed of ink drops. CONSTITUTION:When print instruction is issued, bias control is performed: for instance, the maximum bias is set 5.5mm.. Next, test charging is performed, and a charge signal of about 100V is applied to ink drops with reverse polarity. When those ink drops are detected by a phase retrieval electrode 24, counting with 0.5 mili second is made. This counting is stopped when an output signal is obtained at an ink flying speed detection electrode, and the count value at that time is compared with a specified value at a comparison circuit. If the count value is larger than the specified value, H in the correction table that is for correcting the effects of forerunning five drops and trailing two drops is selected, and when the count value is smaller than the specified value, L in the table is selected to effect strain correction. |
