Liquid Ejection Head Atmospheric Venting for Stable Damper Performance
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Solution Overview
Problem
Existing liquid ejection heads with damper structures experience performance issues due to pressure differences between damper chambers and the ambient environment, leading to changes in damper film behavior and reduced ability to absorb crosstalk pressure waves.
Innovation Solution
Incorporating atmospheric communication ports in the damper chambers to maintain equal pressure with the ambient environment, ensuring the damper film's compliance characteristic remains constant and effectively absorbs pressure fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If damper chambers are sealed to maintain structural integrity, then device reliability is improved, but pressure difference between inside and outside of damper chambers changes with ambient temperature and atmospheric pressure, causing damper film behavior to become unstable
Solution Approach 1:
The damper chamber is segmented into two functional zones: a sealed region that maintains structural integrity and a communication region through the atmospheric communication port that equalizes pressure. This segmentation allows the chamber to simultaneously benefit from both sealing and pressure equalization.
Solution Approach 2:
The atmospheric communication port acts as an intermediary element between the sealed damper chamber and the ambient environment. It mediates the pressure relationship, allowing pressure equalization while maintaining the sealed structure's integrity.
2Reliability
If damper chambers are sealed to prevent contamination, then reliability is improved, but pressure fluctuation absorption capability deteriorates due to pressure differences caused by environmental changes
Solution Approach 1:
The damper chamber structure is segmented to distinguish between the sealed interior space (preventing contamination) and the pressure equalization pathway (maintaining performance). The atmospheric communication port creates a controlled interface between these two requirements.
Solution Approach 2:
Different parts of the damper chamber system have different functional qualities: the main chamber volume maintains a sealed environment for contamination prevention, while the atmospheric communication port provides a localized opening for pressure equalization. This local quality differentiation resolves the contradiction between sealing and pressure sensitivity.
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
The solution maintains desired damper performance by stabilizing damper film behavior, reducing crosstalk between nozzles, and ensuring consistent ejection characteristics despite environmental changes.
Implementation Method 1
a damper film which undergoes elastic deformation and a damper chamber in which air is present. This structure absorbs the pressure fluctuation
Implementation Method 2
an atmospheric communication port through which an inside of the damper chamber communicates with atmosphere
Data Source
AI summary
A liquid ejection head according to the present disclosure is a liquid ejection head including a liquid ejection substrate having: a nozzle substrate having multiple nozzles that eject a liquid; a channel substrate having multiple pressure chambers respectively communicating with the multiple nozzles, multiple individual channels respectively communicating with the multiple pressure chambers, multiple pressure generation units that respectively generate a pressure in the multiple pressure chambers, and a common channel communicating with the multiple individual channels; and a damper substrate having a damper film disposed so as to face a surface of the damper substrate facing an opening plane of a channel communicating with the common channel, and a damper chamber one side of which is covered by the damper film. The liquid ejection substrate includes an atmospheric communication port through which an inside of the damper chamber communicates with atmosphere.