Liquid Ejecting Head Diagonal Nozzle Timing Control
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Solution Overview
Problem
Existing liquid ejecting heads struggle to achieve high resolution in the transport direction due to nozzle misalignment, resulting in dots being formed at positions significantly shifted from ideal positions.
Innovation Solution
A liquid ejecting apparatus with multiple nozzle lines aligned diagonally, where the first and second nozzle lines are controlled to eject ink simultaneously or at different timings, ensuring precise dot formation by synchronizing the ejection of nozzles positioned similarly or differently in the Y direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If nozzles are diagonally aligned relative to transport direction to improve resolution, then dot resolution in transport direction is enhanced, but dots are formed at positions considerably shifted from ideal positions
Solution Approach 1:
The patent applies dynamics by making the ejection timing variable rather than fixed. Nozzles in different nozzle lines eject liquid at different timings that are dynamically adjusted based on their positional relationships, allowing the system to adapt to the diagonal alignment configuration and compensate for position shifts while maintaining high resolution
Solution Approach 2:
The patent changes the ejection timing parameter for nozzles in different nozzle lines. Specifically, nozzles positioned differently in the first direction are set to eject at different timings, while nozzles positioned similarly in the second direction eject at the same timing. This parameter adjustment compensates for the diagonal alignment effect and restores dot position accuracy
2Manufacturing precision
If multiple nozzle lines are used to enhance resolution, then dot resolution is improved, but control complexity increases
Solution Approach 1:
The patent applies local quality by assigning different ejection timing characteristics to different nozzle lines based on their specific positional configurations. Each nozzle line's ejection timing is optimized according to its local arrangement relative to others, allowing precise control without requiring complex global coordination across all nozzles
Data Source
AI summary
The controller controls ejection of liquid such that the first and second nozzles eject liquid at the same timing and the first and third nozzles eject liquid at different timings.