Method of printing printed matters

Claim 1

An ink jet printer for forming colored printed matter on printing paper comprising: an ink jet nozzle provided in connection with said ink jet printer; a plurality of discharge holes formed in a discharge face of said ink jet nozzle, each of said plurality of discharge holes having a reduced diameter orifice whose maximum ink emission amount will discharge an ink drop equal to one-half of a total print dot size to appear on said printing paper and said plurality of discharge holes being equally divided into a plurality of vertical rows, each vertical row corresponding to one ink color; means for introducing print data into said ink jet printer; means for temporarily storing said print data introduced into said ink jet printer, said print data being stored as print signals; control means for controlling an output of said print signals from said means for temporarily storing at predetermined timings; and a discharge driving circuit, responsive to said control means, for generating a discharge driving signal which outputs two ink discharge signals for each said total print dot; said ink jet nozzle being responsive to said discharge driving circuit for discharging two ink drops of said maximum ink emission amounts from said ink jet nozzle onto the same paper position to form said total print dot, said ink jet nozzle discharging two ink drops each of a maximum ink emission amount from one vertical row for a single color representation and discharging one ink drop each of a maximum ink emission amount from two different vertical rows for a mixed color representation; said ink drops being discharged onto the same paper position with a slight positional deviation of said ink drops to form an elliptical print dot on said printing paper.