Liquid Ejection Head Electrode Embedding
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Solution Overview
Problem
In liquid ejection heads, electrodes disposed on the substrate surface lead to inefficient flow of fresh ink with low viscosity into ejection orifices due to low adherence between electrodes and flow passage forming members, resulting in peeling and liquid ejection faults over time.
Innovation Solution
The electrodes are positioned on the surface of the flow passage forming member, with at least a portion covered within the member to maintain adherence and prevent peeling, facilitating efficient ink flow and extended usage without faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If electrodes are disposed on the substrate surface, then the device structure is simple, but the adherence between electrodes and flow passage forming member is low causing peeling and liquid ejection faults
Solution Approach 1:
The electrode positioning transitions from the substrate surface (2D plane) to the flow passage forming member surface (3D structure), adding a vertical dimension to the electrode placement. This dimensional change allows the electrode to be embedded within the flow passage forming member, significantly improving adherence while maintaining structural simplicity.
Solution Approach 2:
The electrode is nested within the flow passage forming member, with at least a portion of the electrode covered by the flow passage forming member. This nesting arrangement secures the electrode in place, preventing peeling and ensuring reliable operation throughout the device lifespan.
2Productivity
If electrodes are disposed on the flow passage forming member surface, then ink flow efficiency is improved, but adherence deteriorates over time causing peeling
Solution Approach 1:
The electrode is nested within the flow passage forming member structure, with the flow passage forming member covering at least a portion of the electrode. This nesting provides mechanical security that prevents peeling over time, ensuring the electrode remains in position throughout the device's operational life while maintaining ink flow efficiency.
Solution Approach 2:
The flow passage forming member is designed to cover and protect the electrode from the beginning, providing preemptive protection against peeling. This beforehand cushioning ensures that the electrode remains securely in place throughout the device's operational life, preventing future adherence deterioration.
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 enhances the adherence between electrodes and the flow passage forming member, suppressing peeling and ensuring sustained liquid ejection performance by maintaining efficient ink flow into ejection orifices, even after prolonged use.
Implementation Method 1
an electrode which is provided on a surface of the flow passage forming member which adjoins the flow passage and which generate a flow of the liquid
Data Source
AI summary
A liquid ejection head including a substrate, an energy generating element which is provided on the substrate and is used for ejecting a liquid, a flow passage forming member which includes an ejection orifice, which ejects the liquid, and which forms a flow passage of the liquid between the flow passage forming member and the substrate, and an electrode which is provided on a surface of the flow passage forming member which adjoins the flow passage and which generates a flow of the liquid, in which at least a portion of the electrode is covered within the flow passage forming member.