Liquid Ejection Head Layout for Crosstalk Damping
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Solution Overview
Problem
Existing liquid ejection heads face issues with crosstalk, where pressure fluctuations from one ejection port affect others, leading to fluctuations in ejection speed and volume, especially when ejection ports are densely packed, and current damping configurations are insufficient due to limited damper width and length, causing ineffective crosstalk suppression.
Innovation Solution
The liquid ejection head design includes ejection port arrays with common supply and collection channels extending along the ejection port direction, featuring damper members on one side of the common collection channels to provide wider damper areas, ensuring effective damping while maintaining high ejection port density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dampers are provided in both branched common supply channels and branched common collection channels, then crosstalk suppression effect is improved, but damper width becomes narrow and damping effect is insufficient
Solution Approach 1:
The invention extracts the damper from one of the two channels (either supply or collection) and eliminates it, keeping dampers only in the channel that requires damping. This removes the conflict between providing dampers in both channels and maintaining sufficient damper width, as dampers are now concentrated in a single channel where they can be sufficiently wide without increasing overall substrate size.
Solution Approach 2:
Instead of providing dampers in both supply and collection channels (excessive action), the invention provides dampers only in the collection channel (partial action), which is sufficient to suppress crosstalk while maintaining adequate damper width. The supply channel dampers are omitted as they are not strictly necessary for effective crosstalk suppression.
2Reliability
If branched common channels are made longer to achieve damping effect, then damping effect is improved, but pressure loss increases and ink cannot be properly supplied
Solution Approach 1:
The invention changes the parameter of damper width (making it sufficiently wide) rather than increasing channel length to achieve the damping effect. This allows effective crosstalk suppression without extending the channel length, thereby avoiding excessive pressure loss that would occur with longer channels.
3Manufacturing precision
If ejection ports are disposed densely to obtain high image quality, then image quality is improved, but crosstalk effect increases and wider damper areas are required
Solution Approach 1:
The invention applies local quality by providing dampers only in the collection channel where crosstalk suppression is most needed, rather than uniformly in both channels. This localized approach effectively addresses the crosstalk problem caused by dense ejection port arrangement while maintaining adequate damper width within the available space.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses crosstalk, maintains stable ink supply, and achieves high ejection port density without increasing substrate size, balancing damping performance and flow rate.
Implementation Method 1
a damper member forming a wall of a part of a channel in the common collection channel
Data Source
AI summary
A liquid ejection head includes: an array of ejection ports; pressure chambers corresponding respectively to and communicating with the ejection ports; individual supply channels and individual collection channels communicating with the chambers; a common supply channel communicating with surfaces of the individual supply channels opposite to surfaces thereof communicating with the chambers; a common collection channel communicating with surfaces of the individual collection channels opposite to surfaces thereof communicating with the chambers; and a damper member forming a wall of a part of a channel in the common collection channel. A wall of a part of a channel in the common supply channel is not formed by the damper member. The common supply channel and the common collection channel are formed so as to extend in a first direction along the ejection port array, and are disposed side by side in a second direction crossing the ejection port array.