Inkjet recording apparatus and method

摘要

An inkjet recording apparatus includes: a paper conveying device which conveys paper; a line-type inkjet head which performs image formation on the paper by ejecting ink droplets to the paper conveyed by the paper conveying device; a paper conveyance speed measuring device which measures a paper conveyance speed of the paper at the image formation by the inkjet head; a dot arrangement data acquiring device which acquires data for arranging dots to form an image by the inkjet head on the paper conveyed at a predetermined paper conveyance speed; a dot arrangement data adjusting device which adjusts the data for arranging dots in accordance with the paper conveyance speed measured by the paper conveyance speed measuring device so that the image is formed on the paper with a constant image density even when the paper conveyance speed varies; and a head drive controlling device which controls drive of the inkjet head in accordance with the adjusted data for arranging dots.

主权项

1. An inkjet recording apparatus, comprising:
a paper conveying device which conveys paper; a line-type inkjet head which performs image formation on the paper by ejecting ink droplets to the paper conveyed by the paper conveying device; a paper conveyance speed measuring device which measures a paper conveyance speed of the paper at the image formation by the inkjet head; a dot arrangement data acquiring device which acquires image data that includes an arrangement of dots in dot data to form an image by the inkjet head on the paper conveyed at a predetermined paper conveyance speed; a dot arrangement data adjusting device which adjusts the image data for arranging the dots in the dot data by changing an arrangement of the dots in the dot data in accordance with the paper conveyance speed measured by the paper conveyance speed measuring device so that the image is formed on the paper with a constant image density on the paper even when the paper conveyance speed varies, to thereby prevent unevenness in image density due to variation in interference between deposited ink droplets on the paper; and a head drive controlling device which controls drive of the inkjet head in accordance with the adjusted data for arranging the dots, wherein the dot arrangement data adjusting device adjusts the image data for arranging dots in accordance with an adjustment information, the adjustment information being information for the image data for arranging dots for each paper conveyance speed, and wherein the adjustment information is information on a gradation curve which represents a relationship between a density of an input image and an appearance rate of dots for each paper conveyance speed.