Importance

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Abstract

The liquid ejection apparatus comprises: a liquid ejection head including a nozzle which ejects liquid, a pressure chamber provided to correspond to the nozzle, a pressure generating element which is disposed on a first wall surface of the pressure chamber and adjusts pressure in the pressure chamber, and a determination element which is disposed on a second wall surface of the pressure chamber and generates a first determination signal corresponding to the pressure in the pressure chamber adjusted by the pressure generating element; a threshold value setting device which sets a threshold value in accordance with a waveform of the first determination signal generated by the determination element; a comparing device which acquires a comparison result obtained by comparing the first determination signal with the threshold value which is set by the threshold value setting device; and an evaluation device which acquires an evaluation result obtained by evaluating a size of an air bubble present in the pressure chamber according to the comparison result acquired by the comparing device.

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First Claim