Patent ID: 8777361
Filing Date: 2014-07-15
Classification: B41J

Abstract:
1. A liquid ejection volume control apparatus, comprising: a first lookup table storage device which stores a first lookup table that specifies an input/output relationship for converting tones of an input signal, wherein the first lookup table includes tone conversion lookup tables which are provided respectively for each of color signals corresponding to a plurality of ink colors, and each of the tone conversion lookup tables specifies an input/output relationship for converting an input signal value of the each of the color signals to an output signal value of the each of the color signals; a second lookup table storage device which stores a second lookup table that specifies a signal conversion relationship for correcting variation in an ejection volume in nozzle units in a liquid ejection head having a plurality of nozzles; a halftone table storage device which stores a halftone table that specifies a relationship between a dot recording rate and a signal value in a dot arrangement obtained by halftone processing; a third lookup table generating device which generates a third lookup table which is used in calculation for evaluating a liquid ejection volume, by extracting a portion of the data from the second lookup table which is prescribed in nozzle units; a third lookup table storage device which stores the third lookup table; an evaluation processing device which performs the calculation for evaluating the liquid ejection volume, the evaluation processing device for performing calculation for evaluating a liquid ejection volume corresponding to an evaluation input signal for evaluating the liquid ejection volume produced by the liquid ejection head, on the basis of the evaluation input signal, the first lookup table, the third lookup table, the halftone table and the liquid volume per dot; and an adjusting device which adjusts the ejection volume on the basis of the evaluation results from the evaluation processing device, in such a manner that the liquid ejection volume corresponding to the evaluation input signal does not exceed a specified value.