Liquid Ejection Head Channel Dampers for Crosstalk Suppression
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Solution Overview
Problem
Existing liquid ejection heads face challenges in suppressing crosstalk between pressure chambers due to limited damper areas, which affects ejection speed and volume, especially when ejection ports are densely arranged, leading to insufficient crosstalk suppression and difficulty in achieving high image quality.
Innovation Solution
The liquid ejection head design includes common supply and collection channels extending along the ejection port array with damper members forming walls of these channels, allowing for larger damper areas to effectively absorb pressure fluctuations, thereby suppressing crosstalk and enabling dense ejection port arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ejection ports are densely arranged to achieve high image quality, then image quality is improved, but crosstalk effect increases and ejection characteristics become unstable
Solution Approach 1:
The liquid channel system is segmented into individual supply channels and individual collection channels for each pressure chamber, rather than using shared common channels. This segmentation isolates pressure fluctuations to individual chambers, preventing crosstalk while maintaining dense ejection port arrangements for high image quality
Solution Approach 2:
A damper is introduced as an intermediary component in the liquid channel to absorb pressure fluctuations. The damper acts as a buffer between pressure chambers, preventing pressure waves from propagating and causing crosstalk, thereby stabilizing ejection characteristics even with dense port arrangements
2Reliability
If damper area is increased to suppress crosstalk, then crosstalk suppression effect is improved, but device area increases
Solution Approach 1:
The damper is positioned locally at specific locations within the liquid channel where pressure fluctuations occur, rather than requiring a large distributed damper area. This localized approach provides effective crosstalk suppression while minimizing the overall device area
Solution Approach 2:
The damper utilizes hydraulic principles to absorb pressure fluctuations through liquid compression and expansion in a confined space. This allows effective crosstalk suppression using a compact hydraulic damper structure rather than a large mechanical structure
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 stabilizes ejection characteristics and enhances image quality and definition by effectively suppressing crosstalk, allowing for high-density ejection port arrangements without compromising performance.
Implementation Method 1
a phenomenon called crosstalk occurs in which a pressure fluctuation occurs in response to ejection of the liquid and this pressure fluctuation propagates to other pressure chambers through liquid channels
Implementation Method 2
part of the walls of these branched channels serves as dampers and absorbs pressures from the pressure chambers to thereby suppress crosstalk
Data Source
AI summary
A liquid ejection head includes: an ejection port array being an array of ejection ports; a plurality of pressure chambers corresponding respectively to the ejection ports and communicating with the ejection ports; individual supply channels and individual collection channels communicating with the pressure chambers; a common supply channel communicating with surfaces of the individual supply channels opposite to surfaces thereof communicating with the pressure chambers; a common collection channel communicating with surfaces of the individual collection channels opposite to surfaces thereof communicating with the pressure chambers; and a damper member forming a wall of a part of at least one of the common supply channel or the common collection channel. 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.