Patent ID: 7784921
Filing Date: 2010-08-31
Classification: B41J

Abstract:
1. A liquid ejection head which forms an image, comprising: a nozzle from which liquid is ejected in a combination ejection direction and which includes a first nozzle region and a second nozzle region demarcated by a partition; a pressure chamber unit which includes a first pressure chamber connected to the first nozzle region and a second pressure chamber connected to the second nozzle region, the first pressure chamber and the second chamber being demarcated by the partition; and a single piezoelectric element which vibrates the first pressure chamber at a first resonance frequency and the second pressure chamber at a second resonance frequency in accordance with an electric field applied to the single piezoelectric element, the first resonance frequency being different from the second resonance frequency, wherein: the liquid in the first nozzle region is ejected in a first ejection direction at a first ejection speed and the liquid in the second nozzle region is ejected in a second ejection direction different from the second ejection direction at a second ejection speed in such a manner that the liquid ejected from the first nozzle region and the liquid ejected from the second nozzle region combine together at an end of the nozzle; and the combination ejection direction in which the liquid is ejected from the nozzle is controlled by adjusting a waveform of the electric field applied to the single piezoelectric element so that the first ejection speed of the liquid ejected from the first nozzle region is different from the second ejection speed of the liquid ejected from the second nozzle region.