Liquid Ejection Head Channel Forming Member Ink Permeation
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Solution Overview
Problem
The existing liquid ejection heads face issues with ink permeation into the channel forming member, leading to deformation and reduced long-term reliability, especially when using inks with high permeability.
Innovation Solution
The liquid ejection head incorporates a channel forming member made from a cured substance of a photosensitive resin composition containing an epoxy resin and a compound with a ligand having a lone electron pair, which is in contact with a substrate having an inorganic material layer, and the content of this compound is within a specific range to enhance adhesion and prevent ink permeation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a photosensitive resin layer is used to form the channel forming member, then high pattern accuracy can be achieved through photolithography, but ink permeation causes deformation and peeling over time
Solution Approach 1:
The patent changes the chemical composition parameters of the photosensitive resin by incorporating specific compounds (silane coupling agents, adhesion promoters, crosslinking agents) that modify the cured resin's properties to resist ink permeation while maintaining pattern accuracy
Solution Approach 2:
The patent creates a composite photosensitive resin composition combining epoxy resin with multiple functional additives including silane coupling agents, adhesion promoters, and crosslinking agents to achieve both manufacturing precision and long-term reliability
2Reliability
If an ink with high boiling point solvent is used to improve fixing properties, then better print quality is achieved, but the ink permeates into the photosensitive resin layer faster causing deformation
Solution Approach 1:
The patent uses a sacrificial release layer that can be removed after serving its temporary purpose of preventing ink permeation during the critical curing period, allowing the use of high-permeability inks without long-term damage
Solution Approach 2:
The patent modifies the chemical parameters of the photosensitive resin composition to include compounds that create a more resistant cured structure, changing the resin's permeability characteristics to withstand high-boiling-point ink solvents
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 prevents ink permeation into the channel forming member, thereby suppressing peeling and ensuring excellent pattern reproducibility and print quality, even with inks of high permeability.
Implementation Method 1
When a compound that contains a ligand having a lone electron pair is used, a coordinate bond is formed with a metal, preferably any of a 4-membered ring structure, a 5-membered ring structure, or a 6-membered ring structure, which is effective in improving the adhesion to the inorganic material layer
Implementation Method 2
a channel forming member which is a cured substance of a photosensitive resin composition
Data Source
AI summary
A liquid ejection head includes a substrate, an ejection port forming member, and a channel forming member, in which the ejection port forming member and the channel forming member are provided on the substrate. The channel forming member is a cured substance of a photosensitive resin composition formed of a resin and a compound that contains a ligand having a lone electron pair, and is in contact with the substrate including an inorganic material layer on a surface thereof, and a content of the compound that contains a ligand having a lone electron pair is in a range of 1.0% by mass to 5.0% by mass with respect to 100% by mass of an epoxy resin contained in the photosensitive resin composition.