INK JET PRINTER, INK FOR INK JET PRINTER, AND INK JET PRINTING METHOD

摘要

PROBLEM TO BE SOLVED: To provide an ink jet printer having a mechanism for unclogging the nozzle of an ink jet head to recover ejection. SOLUTION: The ink jet printer 100 printing on a sheet S by ejecting ink through nozzles based on image information comprises a light source unit 148 for irradiating the forward end part of a nozzle being connected with the atmosphere with light. The ink is an aqueous ink comprising a coloring agent, an aqueous solvent, and a photosensitive substance producing an acid or a base through irradiation with light from the light source unit 148.