Patent ID: 6196736
Filing Date: 2001-03-06
Classification: B41J

Abstract:
A bidirectional printing apparatus that bidirectionally prints images on a print medium during forward and reverse main scanning passes in accordance with print image signals, the apparatus comprising:a print head able to print plural types of dots at each pixel position on the print medium, the plural types of dots being different at least in density;a main scanning drive section that effects bidirectional main scanning by moving at least one selected from the print medium and the print head;a sub-scanning drive section that effects sub-scanning by moving at least one selected from the print medium and the print head;a head drive section that supplies drive signals to the print head to effect printing on the print medium; anda controller for controlling bidirectional printing, the controller having a printing position adjuster that reduces printing positional deviation arising between forward and reverse main scanning passes with an adjustment value, the adjustment value being set with respect to at least one type of specific target dots other than those dots having the highest density out of the plural types of dots.