Liquid Ejecting Head Inclined Wall Surface Air Bubble Removal
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Solution Overview
Problem
Existing liquid ejecting heads face issues with air bubbles remaining in channels, leading to ejection abnormalities that hinder ink flow from nozzles, due to the design of communication channels and pressure chambers, which affects the quality of images produced.
Innovation Solution
The liquid ejecting head incorporates a design with inclined surfaces between specific wall surfaces of communication channels and nozzle channels, facilitating smoother ink flow and reducing the likelihood of air bubbles, while also allowing pressure chambers to communicate through dedicated channels, enhancing the ejection process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If communication channels are designed to extend in directions crossing the nozzle direction, then pressure chambers can effectively communicate with the nozzle channel, but air bubbles may remain in the channel causing ejection abnormalities
Solution Approach 1:
The patent introduces inclined surfaces (fifth wall surfaces) that extend in directions between the nozzle direction and the communication channel direction. These inclined surfaces create curved flow paths that prevent air bubbles from stagnating in the channel, allowing bubbles to be naturally discharged along with the liquid flow while maintaining effective pressure transmission from the pressure chambers to the nozzle.
2Productivity
If multiple pressure chambers are used to apply pressure to liquid, then ejection performance can be improved, but the structure becomes more complex
Solution Approach 1:
The patent combines multiple pressure chambers (first and second pressure chambers) that both communicate with the same nozzle channel through dedicated communication channels. This merging approach allows multiple pressure sources to work together to improve ejection performance and liquid supply reliability, while the shared nozzle channel structure prevents the system from becoming overly complex by consolidating the ejection pathway.
Data Source
AI summary
Wall surfaces of the nozzle channel include a first wall surface which extends in the first direction and in which the nozzle is provided and a second wall surface which extends in the first direction and is opposite to the first wall surface, wall surfaces of the first communication channel include a third wall surface which extends in the second direction and a distance from which to the nozzle in the first direction is longest and a fourth wall surface which extends in the second direction and is opposite to the third wall surface, and a fifth wall surface which extends in a third direction set between the first direction and the second direction is provided between the second wall surface and the fourth wall surface.