Importance

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Abstract

An ink jet recording apparatus includes an ink jet recording head which has an ink ejection outlet, an ink passage, a heater for heating ink to form a bubble in the ink so as to allow a part of the ink to be ejected from the ink ejection outlet in the form of an ink droplet, and a driving circuit for applying a driving signal group to the heater. The driving signal circuit serves to apply a driving signal group including one or more pulses per a single pixel to the heater corresponding to the value representing an input image signal. In response to this input image signal, an ink droplet group having independent ink droplets is ejected from the ejection outlet toward a recording sheet. Since a quantity of ink ejected per a single pixel is variably controlled by changing the number of ink droplet ejection, each recording operation can be achieved while maintaining excellent gray scale properties.

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First Claim