Ink jet printing head embodiment with drive signal circuit outpu

Incremental printing of symbolic information – Ink jet – Controller

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347 11, B41J 2205

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active

059800151

ABSTRACT:
A drive device for an ink jet type printing head which makes it possible to jet ink droplets having different sizes from the same nozzle, and with which the resultant image is high in picture quality and in gradation, and the printing operation is achieved at high speed. The drive device includes a drive signal generating circuit (23) which outputs within one printing period a first drive signal which is used to jet a relatively large ink droplet from the nozzle opening, and a second drive signal in succession to the first drive signal which is used to jet a relatively small ink droplet from the same nozzle opening. In response to a printing signal, one of the first and second drive signals is selected and applied to the piezo-electric elements (6) of the printing head. Thus, ink droplets having different sizes are selectively from the same ink nozzle.

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