Nozzle Array Ejection Density Control for Ripple Mark Prevention
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Solution Overview
Problem
Conventional printing devices with high-density nozzle arrangements and high-speed print heads often produce uneven print results due to ripple marks, leading to deteriorated print speed and quality.
Innovation Solution
The printing device achieves the target print resolution by moving a nozzle array with a lower nozzle pitch and ejecting liquid droplets from the same or another nozzle array, while applying preset rate thinning to adjust ejection density across nozzle blocks, allowing for efficient control of ripple marks without interpolating print regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If thinning is performed to prevent ripple marks by interpolating images at plural passes, then ripple marks are eliminated, but print speed deteriorates
Solution Approach 1:
The nozzle array is divided into multiple nozzle blocks with different ejection densities. By segmenting the nozzle array, the system can selectively control which nozzles eject at each pass, enabling ripple mark prevention without requiring multiple interpolation passes, thus maintaining print speed while improving print quality.
Solution Approach 2:
Different nozzle blocks are assigned different ejection densities based on their positions and functions. This local differentiation allows the system to optimize printing performance in different regions, preventing ripple marks where needed while maintaining high print speed in other areas, resolving the contradiction between quality and speed.
2Manufacturing precision
If a high density nozzle array is used to achieve high print resolution, then target print resolution is improved, but ripple marks occur more frequently
Solution Approach 1:
The high-density nozzle array is segmented into multiple nozzle blocks with varying ejection densities. This segmentation allows the system to maintain the high resolution capability of the dense nozzle array while selectively suppressing ripple marks by controlling which nozzle blocks eject at each pass, thus resolving the contradiction between resolution and ripple mark prevention.
Solution Approach 2:
The ejection density parameter is dynamically adjusted across different nozzle blocks. By changing the ejection density parameter locally in different nozzle blocks, the system can maintain high print resolution where needed while reducing ripple marks in other regions, achieving both high resolution and ripple mark prevention.
3Object-affected harmful factors
If thinning is applied at high rates to control ripple marks, then ripple mark control is improved, but ejection density and print quality deteriorate
Solution Approach 1:
Different nozzle blocks are assigned different ejection densities based on their specific functions and positions. This local quality differentiation allows the system to apply thinning only where necessary to control ripple marks, while maintaining high ejection density in other regions to preserve print quality, thus resolving the contradiction between ripple mark control and ejection density.
Solution Approach 2:
The system implements local quality control by assigning different ejection densities to different nozzle blocks. This allows selective thinning in specific regions to control ripple marks while maintaining high ejection density in other regions, preventing the overall deterioration of print quality that would occur with uniform high-rate thinning.
Data Source
AI summary
In a printing device, printing is performed by relatively moving a nozzle array for ejecting a liquid droplet with respect to a print medium, a resolution by a nozzle pitch of the nozzle array is lower than a target print resolution, and between liquid droplets ejected by a single nozzle array, liquid droplets are ejected from the same or another nozzle array to attain the target print resolution. Each of a plurality of nozzles in the single nozzle array is printable by changing an ejection density by applying a preset rate thinning when ejecting liquid droplets by relatively moving with respect to the print medium. The printing device is provided with a print control part configured to perform printing by dividing the single nozzle array into a plurality of nozzle blocks and determining the ejection density in every nozzle blocks.