| 摘要 |
PROBLEM TO BE SOLVED: To provide the driving device of an ink-jet type printing head capable of ejecting different ink from one and the same nozzle, obtaining a high quality gradation picture, and printing at high speed. SOLUTION: A driving signal generating circuit 23 is provided for generating second driving signals to eject small ink droplets following the first driving signals to eject large ink droplets within one printing period, and by applying either driving signal selectively to the piezoelectric vibrator, different ink droplets are discharged from one and the same nozzle. |
