Printing method and printing apparatus

摘要

The invention aims to form an ink coating having a predetermined film thickness on a surface of a printing medium having a three-dimensional structure in shorter time. As solving means, a plurality of times of scanning process is included, ink 80 is discharged to head-facing areas (10a, 10c) in a state of facing straight toward a printhead 110 in one scanning process, and the ink 80 is discharged to a non-head-facing area (10b) so that the total film thickness of the ink coatings (11, 12) to be formed without facing straight toward the printhead 110 in two or more times of the scanning process becomes a predetermined film thickness T0.

主权项

1. A printing method comprising:
a plurality of times of a scanning process including scanning with a printhead for ink jet printing and discharging ink to a printing medium from the printhead, characterized in that including differentiating head-facing areas to which the ink is discharged in a state of facing straight toward the printhead from each other in the respective scanning processes, discharging the ink to a non-head-facing area to which the ink is discharged in a state of not facing straight toward the printhead in any of the scanning processes without facing the non-head-facing area straight toward the printhead also in other one or more scanning processes, and adjusting the amount of the ink to be discharged in the non-head-facing area in at least one of the scanning processes so that the total film thickness of the ink coating formed in the non-head-facing area becomes a predetermined film thickness, wherein when the ink is discharged to one point in the non-head-facing area in the n times (n is integers of 2 or larger) of the scanning process, an amount Di of the ink to be discharged to the point in the i-th scanning process is set so as to satisfy the following expression (2)
Di=ki×D0  (2)(where D0 denotes the amount of the ink to be discharged to one point in the head-facing area in the respective scanning processes) by using a coefficient of adjustment ki set so as to satisfy the following expression (1)[Expression⁢⁢1]∑i=1n⁢(ki⁢cos⁢⁢θi)=1(1) (where θi is an angle smaller than 90°, and indicates an angle formed between a discharging direction of the ink in the i-th scanning process among the n times of the scanning process and a normal direction of the printing medium at that time point.).