Liquid Ejection Head Flow Passage Design for Adhesive Spread Control
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Solution Overview
Problem
Existing liquid ejection heads face challenges in reducing adhesive spread while maintaining sealability, particularly when using adhesives with reduced flowability, which can compromise damper performance.
Innovation Solution
The use of a second flow passage member with a Young's modulus of 65 GPa or less, combined with a thinner adhesive layer, to enhance deformation and reduce adhesive spread while ensuring sealability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the flowability of the adhesive is reduced to reduce adhesive spread, then adhesive spread is reduced, but sealability with respect to liquid may be reduced
Solution Approach 1:
The patent changes the physical parameter of the adhesive by controlling its viscosity within a specific range (100-10000 mPa·s at 25°C) to simultaneously achieve reduced adhesive spread and maintained sealability. This parameter optimization allows the adhesive to remain sufficiently flowable for sealing while being less prone to excessive spread onto the damper.
Solution Approach 2:
The patent applies different adhesive properties to different locations: the adhesive is formulated to have controlled flowability for the bonding area while maintaining sufficient sealability in the sealing regions. This localized quality control ensures that the adhesive performs differently in different functional zones of the liquid ejection head.
2Manufacturing precision
If a member is added to reduce adhesion of adhesive onto damper, then adhesion reduction is achieved, but device complexity increases
Solution Approach 1:
Instead of adding a separate member to prevent adhesive adhesion to the damper, the patent changes the parameter of the adhesive itself by controlling its viscosity. This approach achieves the same functional result (reduced adhesive spread) without increasing device complexity or adding extra components.
Solution Approach 2:
The patent extracts the function of preventing adhesive spread from the structural domain (by removing the need for additional protective members) and transfers it to the material domain (by optimizing adhesive viscosity). This eliminates the need for extra components while maintaining the desired effect.
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 allows for reduced adhesive spread and improved sealability, maintaining damper performance and stability in liquid ejection heads.
Implementation Method 1
a damper configured to be elastically deformed in a case where a pressure of the liquid is increased by the pressure generating element
Data Source
AI summary
There is used a liquid ejection head including: a plurality of nozzles for ejecting liquid; a plurality of pressure chambers corresponding to the plurality of nozzles; a plurality of pressure generating elements arranged in the plurality of pressure chambers, and for generating a pressure for ejection; a plurality of first flow passages corresponding to the plurality of pressure chambers; a second flow passage communicating with the plurality of first flow passages, and common to the plurality of pressure chambers; and a damper that is elastically deformed when a pressure of the liquid is increased by the pressure generating element. The liquid is supplied to each of the plurality of pressure chambers from the common second flow passage via the plurality of first flow passages, and a Young's modulus of the second flow passage member configuring the second flow passage is 65 GPa or less.