Liquid Discharging Apparatus Pixel-Level Droplet Control
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Solution Overview
Problem
Existing liquid discharging apparatuses face challenges in accurately calculating the total discharge amount of liquid from nozzles due to variations in discharge duty, leading to discrepancies between calculated and actual discharge amounts.
Innovation Solution
A liquid discharging apparatus and method that selects liquid droplet amounts for each pixel from at least three kinds and calculates the total discharge amount based on these selections and discharge duty, which is the density of liquid droplets per unit area of the recording medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the total discharge amount is calculated by multiplying liquid droplet amounts by numbers of dots, then the calculation is simple, but the precision is low due to discharge duty variations
Solution Approach 1:
The patent changes the calculation parameter from a simple count-based method to a discharge duty-based method. By introducing discharge duty (density of liquid droplets per unit area) as a new parameter, the system can accurately calculate total discharge amount while accounting for variations in discharge conditions, thus resolving the contradiction between simplicity and precision.
2Reliability
If discharge duty variations are not considered, then the calculation method is simple, but the accuracy of total discharge amount decreases
Solution Approach 1:
The patent implements feedback by using discharge duty information to correct the total discharge amount calculation. The controller calculates the total discharge amount based on both liquid droplet amounts and discharge duty, creating a feedback mechanism that accounts for actual discharge conditions and improves accuracy reliably.
3Manufacturing precision
If liquid droplet amounts are selected from multiple kinds for each pixel, then the recording quality is improved, but the calculation complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the recording process into pixel-level control with multiple liquid droplet amount levels (0, small, medium, large). This segmentation allows precise control of liquid discharge at each pixel while maintaining manageable complexity through systematic categorization of droplet amounts.
Data Source
AI summary
A liquid discharging apparatus includes: a head having a plurality of nozzles; and a controller. The controller executes: a discharging processing of discharging liquid, from each of the nozzles toward a recording medium, in a liquid droplet amount which is selected for each of pixels from at least three kinds of liquid droplet amounts; and a total discharge amount calculating processing of calculating a total discharge amount of the liquid to be discharged from the nozzles in the discharging processing, based on the liquid droplet amount selected for each of the pixels and a discharge duty which is density of the liquid droplet per a unit area of the recording medium.