Nozzle Row Correction for Multi-Color Inkjet Dot Alignment
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Solution Overview
Problem
In ink jet printers with multiple nozzle rows discharging different colors, attachment errors lead to worse deviation in dot formation positions between different color inks, deteriorating the image quality due to consideration of only same-color nozzle row errors.
Innovation Solution
A method to acquire correction values for liquid discharging apparatuses by calculating heterogeneous row errors and overlapping area errors across nozzle rows, adjusting discharge data to align dot formations accurately across different color ink nozzles, thereby preventing image deterioration from attachment errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If only the attachment error of same color nozzle rows adjacent in the Y direction is taken into consideration, then the deviation of same color dot formation position is improved, but the deviation of different color dot formation position becomes worse
Solution Approach 1:
The patent segments the error correction into two distinct components: heterogeneous row error (attachment error between different color nozzle rows) and overlapping area error (deviation in overlapping regions). By separately acquiring and correcting these two error types, the system addresses both same-color and different-color dot formation deviations simultaneously, resolving the contradiction between improving same-color alignment and maintaining different-color alignment.
Solution Approach 2:
The patent changes the correction parameters by introducing a dual-error correction model that adjusts discharge data based on both heterogeneous row error and overlapping area error. This parameter expansion allows the system to compensate for attachment errors in multiple dimensions, improving overall image quality while maintaining dot formation precision across different color inks.
2Area of stationary object
If multiple nozzle rows are placed in the Y direction to print large width images, then the printing width capability is improved, but the image deterioration due to attachment error of different color nozzle rows becomes worse
Solution Approach 1:
The patent segments the multi-nozzle row system into reference nozzle rows and target nozzle rows, with separate error acquisition and correction processes for each. By treating each nozzle row's attachment error independently and applying specific correction values to each, the system maintains dot formation accuracy across multiple nozzle rows used for large width printing.
Solution Approach 2:
The patent introduces correction in the Y direction (perpendicular to the discharge direction) by acquiring heterogeneous row errors that capture attachment deviations in the vertical dimension. This additional dimensional correction enables accurate multi-color dot formation even when multiple nozzle rows are arranged in the Y direction for extended printing width.
Data Source
AI summary
There is provided a method of acquiring a correction value of a liquid discharging apparatus that includes a first nozzle row, a second nozzle row, a third nozzle row, and a fourth nozzle row, the method includes: acquiring the amount of deviation (heterogeneous row error) of a dot formed by the third nozzle row in the predetermined direction, acquiring the amount of deviation (overlapping area error) between the dot formed by the third nozzle row and a dot formed by the fourth nozzle row in the predetermined direction, and acquiring a correction value which causes discharge data assigned to the fourth nozzle row to shift in the predetermined direction based on the heterogeneous row error and the overlapping area error.