Liquid Ejection Head Pressure Adjustment Chamber Design
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Solution Overview
Problem
Existing liquid ejection heads face challenges in stabilizing pressure adjustments within the liquid reservoir portion, leading to instability in ink supply and potential issues with printed images due to sudden pressure changes and incomplete recovery of ink.
Innovation Solution
A liquid ejection head with a pressure adjustment chamber featuring an elastic deformation portion and a support portion, where the area between them has higher rigidity, allowing for stable volume changes in response to gas pressure and preventing complete deformation under negative pressure, ensuring consistent ink supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an elastic deformation member with continuous curved surfaces is used, then the deformation is stabilized, but the pressure adjustment stability is insufficient
Solution Approach 1:
The elastic deformation member is designed with different surface characteristics in different regions: the peripheral portion has flat surfaces that contact the support portion, while the central portion has curved surfaces that deform elastically. This local differentiation allows the peripheral area to provide stable support while the central area enables controlled deformation, resolving the contradiction between deformation stability and pressure adjustment stability.
2Stress or pressure
If the elastic deformation member deforms completely under negative pressure, then pressure adjustment is achieved, but complete deformation occurs leading to ink supply instability
Solution Approach 1:
The elastic deformation member incorporates curved surfaces in the central portion that enable elastic deformation for pressure adjustment. The curved geometry allows the member to deform and recover smoothly under pressure changes, preventing complete deformation while maintaining effective pressure adjustment capability, thus ensuring stable ink supply.
3Ease of operation
If the area between elastic deformation portion and support portion has lower rigidity, then deformation is easier, but structural stability is reduced
Solution Approach 1:
The elastic deformation member is designed with different rigidity characteristics in different regions: the peripheral portion has higher rigidity with flat surfaces that provide stable support to the liquid reservoir, while the central portion has lower rigidity with curved surfaces that deform easily under pressure. This local differentiation resolves the contradiction between deformation ease and structural stability.
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 stabilizes pressure adjustments within the liquid ejection head, maintaining consistent ink supply and preventing complete deformation, thus ensuring stable printing operations and minimizing the impact on printed images.
Implementation Method 1
an elastic deformation portion configured so that an inner volume thereof can be changed according to a gas pressure
Data Source
AI summary
A liquid ejection head includes an ejection port configured to eject liquid, a liquid reservoir portion configured to supply the liquid to the ejection port, and a pressure adjustment chamber configured to communicate with the liquid reservoir portion. The pressure adjustment chamber includes an elastic deformation portion configured so that an inner volume thereof can be changed according to a gas pressure and a support portion configured to support the elastic deformation portion on the liquid reservoir portion. An area between the elastic deformation portion and the support portion has higher rigidity than the elastic deformation portion.