Importance

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Abstract

Disclosed is a printing apparatus that is capable of stable printing even when the number of printing elements driven simultaneously varies. The printing apparatus includes an input data processor for expanding compressed print data, which has been transmitted from a host device, and outputting a print code sequence; a heat-data generator for generating and outputting heat data, which corresponds to each heater, every heat cycle based upon the print code sequence, and simultaneously counting the number of dots of ink discharged at the same time and outputting a power supply selection signal; a multiple power supply circuit for outputting three different voltages; and a power supply selector which, in accordance with the selection signal [SL (1:0)], selects heater driving power from among the three different voltages and outputs the selected power to a printhead.

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First Claim