| 摘要 |
PCT No. PCT/JP96/03417 Sec. 371 Date Jul. 17, 1997 Sec. 102(e) Date Jul. 17, 1997 PCT Filed Nov. 21, 1996 PCT Pub. No. WO97/18953 PCT Pub. Date May 29, 1997A circuit for driving an ink-jet head comprising a common driving waveform generation circuit 11 for generating a driving voltage signal, an analog/digital converter circuit 12 for converting the driving voltage signal into driving waveform data, a gradation data separation/accumulation circuit 13 for separating printing gradation data contained in printing data therefrom, accumulating therein the separated printing gradation data temporarily, and outputting the separated printing gradation data at a predetermined timing, a comparator circuit 14 for comparing the printing gradation data with the driving waveform data and outputting a comparison signal. The circuit further comprises a printing control circuit 15 for judging presence of an ink discharge instruction signal contained in the printing data and outputting a switch control signal, a switch control circuit 16 for making a logical product by the comparison signal and the switch control signal, and outputting an analog switch control signal, and a bidirectional analog switch for controlling conductivity of the driving voltage signal so as to drive the piezoelectric actuator in accordance with the analog switch control signal. As a result, volume of ink droplets discharged from a nozzle can be controlled to comply with a picture image with density gradation, and free vibrations generated in the piezoelectric actuator are damped to thereby obtain ink droplets with a constant speed regardless of the size of the ink droplets.
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